Hydrocarbon Processing - May 2022 - 68
History of the HPI
synthetic oils were used for military and
commercial air travel.
It was not until the 1960s that the idea
of using synthetic oils in the automobile
industry could provide significant
benefits to engine performance. American
pilot and inventor Albert Amatuzio
conducted research in the 1960s on the
use of synthetic lubricants in automobile
engines. As a squadron commander
in the Minnesota Air National Guard
and WW2 fighter pilot (he flew America's
first operational fighter jet, the F80
Shooting Star),101
the benefits synthetic lubricants provided
aircraft engines. His goal was to find
a way for automobile engines to gain the
same lubricating benefits.
In 1966, Amatuzio formulated his first
synthetic motor oil, testing it in his colleague's
new 1966 Ford station wagon.98
After the successful test, he continued to
develop new synthetic oils and sell them
throughout the late 1960s under the name
AMSOIL. However, the public was slow
to adopt Amatuzio's new synthetic motor
oil despite the many benefits it provided
vs. conventional lubricating oils. The primary
challenge was price, as synthetic
motor oil costs several times more than
conventional motor oil.98
Seeking additional validation of performance
standards established by the
American Petroleum Institute (API) and
the Society of Automotive Engineers,
Amatuzio had his motor oil tested by a
third-party laboratory in 1972. After rigorous
tests, AMSOIL Synthetic Motor
Oil became the world's first synthetic motor
oil to meet API service requirements.98
This validation, along with major oil companies
producing their own synthetic lubricating
oils for the auto industry, would
eventually lead to widespread adoption of
synthetic motor oils for automobiles.
After Amatuzio's accreditation and
continued sales of his novel product, Mobil
followed suit, creating the first Mobil
1 fully synthetic motor oil in 1971-the
company first introduced Mobilgrease 28
(still in use) in the early 1960s to prevent
military plane wheel bearings from failing
during landings in cold temperatures, followed
by the Mobil-brand synthetic oil
technology for big diesel engines powering
oil drilling rigs on Alaska's North
Slope (U.S.) in temperatures as low as
-40°C in the late 1960s.102
Amatuzio was aware of
The formation of OPEC. Following
WW2, global oil consumption began to expand
significantly. During this timeframe,
the U.S. was simultaneously the world's
largest consumer and producer of oil, and
global oil supplies were dominated by the
Seven Sisters (five were headquartered in
the U.S.)-Anglo-Iranian Oil Co. (now
bp), Royal Dutch Shell, Standard Oil Co.
of California (now Chevron), Gulf Oil
and Texaco (both merged into Chevron),
Standard Oil Co. of New Jersey and Standard
Oil Co. of New York (both are now
ExxonMobil). Up until the early 1970s,
these multinational organizations controlled
approximately 85% of the world's
petroleum reserves-this included large
oil reserves in the Middle East.103
Wanting to control more of its domestic
reserves, several oil exporting countries-Iran,
Iraq, Kuwait, Saudi Arabia
and Venezuela-convened in Baghdad,
Iraq in September 1960 (FIG. 2). This
historic meeting's (the Baghdad Conference)
goal was to discuss ways to increase
crude oil pricing produced by these countries,
as well as ways to respond to unilateral
actions by the Seven Sisters and
other multinational organizations.103
This
meeting led to the creation of the Organization
of Petroleum Exporting Countries
(OPEC), which witnessed its member
countries increase over the next 15 yr.
OPEC grew in prominence during the
1970s, as its member countries gained
greater control of their domestic production
and began to play a greater role in
world oil markets.104
The organization
still plays a decisive role in crude oil production,
with the ability to significantly
affect crude oil pricing globally.
During the 1960s, the Middle East
FIG. 2. The delegation of Saudi Arabia at
the historic Baghdad Conference in midSeptember
1960. Photo courtesy of OPEC.
68 MAY 2022 | HydrocarbonProcessing.com
also witnessed the expansion of regional
refining and petrochemical capacity. For
example, the Ras Tanura refinery in Saudi
Arabia expanded its capacity from 50,000
bpd to 210,000 bpd.69
Kuwait National
Petroleum Co. expanded the Mina Abdullah
refinery's capacity from 30,000 bpd
to 145,000 bpd in 1963, as well as commissioned
the 95,000-bpd Shuabia refinery
in April 1968-the Shuabia refinery
increased processing capacity to 195,000
bpd in 1975. The Shuabia refinery eventually
closed in 2017; however, its infrastructure
was incorporated into the country's
capital-intensive Clean Fuels Project.105
The Shuaiba Industrial Zone also housed
Kuwait's first chemical fertilizer complex.
Petrochemicals Industries Co.-established
in 1963-commissioned the facility
in 1967, which was the first of its kind in
the Middle East. Saudi Arabia and Qatar
followed suit, establishing the Saudi Arabian
Fertilizer Co. in 1965 and the Qatar
Fertilizer Co. in 1969.106
Synthetic zeolite catalysts are patented
and commercialized. The term
zeolite-microporous, aluminosilicate
minerals-was first coined by Swedish
mineralogist Axel Fredrik Cronstedt in
1756.107
Cronstedt, who is most noted
for discovering the elements nickel and
scheelite (later to be known as tungsten),
discovered zeolite after heating the mineral
stillbite (tectosilicate minerals of the
zeolite group) with a blowpipe flame.
The process produced a large amount of
steam from water that had been absorbed
by the mineral.107,108
After observing the
reaction, Cronstedt coined the mineral
" zeolite " from the Greek words " to boil "
and " stone. " 107
Modern research and development of
synthetic zeolites were pioneered by individuals
such as New Zealand-born chemist
Richard Barrer (his work in adsorption
and synthesis began the era of synthetic
zeolites); Robert Milton, Donald Breck
and T. B. Reed at Union Carbide (their
work during the late 1940s/early 1950s
led to the discovery of synthetic zeolites
A, X and Y); and Jule Rabo and Edith
Flanigen who both worked with Milton's
team at Union Carbide. Rabo led the
catalyst research group at Union Carbide
from 1957-1961 and played a key role in
the discovery of the catalytically active ingredient
used worldwide in the catalytic
cracking of gasoils to produce gasoline.109
Flanigen was instrumental in the development
of zeolite Y. In his historical perspective
on zeolite research, Milton described
http://www.HydrocarbonProcessing.com
Hydrocarbon Processing - May 2022
Table of Contents for the Digital Edition of Hydrocarbon Processing - May 2022
Contents
Hydrocarbon Processing - May 2022 - Cover1
Hydrocarbon Processing - May 2022 - Cover2
Hydrocarbon Processing - May 2022 - Contents
Hydrocarbon Processing - May 2022 - 4
Hydrocarbon Processing - May 2022 - 5
Hydrocarbon Processing - May 2022 - 6
Hydrocarbon Processing - May 2022 - 7
Hydrocarbon Processing - May 2022 - 8
Hydrocarbon Processing - May 2022 - 9
Hydrocarbon Processing - May 2022 - 10
Hydrocarbon Processing - May 2022 - 11
Hydrocarbon Processing - May 2022 - 12
Hydrocarbon Processing - May 2022 - 13
Hydrocarbon Processing - May 2022 - 14
Hydrocarbon Processing - May 2022 - 15
Hydrocarbon Processing - May 2022 - 16
Hydrocarbon Processing - May 2022 - 17
Hydrocarbon Processing - May 2022 - 18
Hydrocarbon Processing - May 2022 - 19
Hydrocarbon Processing - May 2022 - 20
Hydrocarbon Processing - May 2022 - 21
Hydrocarbon Processing - May 2022 - 22
Hydrocarbon Processing - May 2022 - 23
Hydrocarbon Processing - May 2022 - 24
Hydrocarbon Processing - May 2022 - 25
Hydrocarbon Processing - May 2022 - 26
Hydrocarbon Processing - May 2022 - 27
Hydrocarbon Processing - May 2022 - 28
Hydrocarbon Processing - May 2022 - 29
Hydrocarbon Processing - May 2022 - 30
Hydrocarbon Processing - May 2022 - 31
Hydrocarbon Processing - May 2022 - 32
Hydrocarbon Processing - May 2022 - 33
Hydrocarbon Processing - May 2022 - 34
Hydrocarbon Processing - May 2022 - 35
Hydrocarbon Processing - May 2022 - 36
Hydrocarbon Processing - May 2022 - 37
Hydrocarbon Processing - May 2022 - 38
Hydrocarbon Processing - May 2022 - 39
Hydrocarbon Processing - May 2022 - 40
Hydrocarbon Processing - May 2022 - 41
Hydrocarbon Processing - May 2022 - 42
Hydrocarbon Processing - May 2022 - 43
Hydrocarbon Processing - May 2022 - 44
Hydrocarbon Processing - May 2022 - 45
Hydrocarbon Processing - May 2022 - 46
Hydrocarbon Processing - May 2022 - 47
Hydrocarbon Processing - May 2022 - 48
Hydrocarbon Processing - May 2022 - 49
Hydrocarbon Processing - May 2022 - 50
Hydrocarbon Processing - May 2022 - 51
Hydrocarbon Processing - May 2022 - 52
Hydrocarbon Processing - May 2022 - 53
Hydrocarbon Processing - May 2022 - 54
Hydrocarbon Processing - May 2022 - 55
Hydrocarbon Processing - May 2022 - 56
Hydrocarbon Processing - May 2022 - 57
Hydrocarbon Processing - May 2022 - 58
Hydrocarbon Processing - May 2022 - 59
Hydrocarbon Processing - May 2022 - 60
Hydrocarbon Processing - May 2022 - 61
Hydrocarbon Processing - May 2022 - 62
Hydrocarbon Processing - May 2022 - 63
Hydrocarbon Processing - May 2022 - 64
Hydrocarbon Processing - May 2022 - 65
Hydrocarbon Processing - May 2022 - 66
Hydrocarbon Processing - May 2022 - 67
Hydrocarbon Processing - May 2022 - 68
Hydrocarbon Processing - May 2022 - 69
Hydrocarbon Processing - May 2022 - 70
Hydrocarbon Processing - May 2022 - 71
Hydrocarbon Processing - May 2022 - 72
Hydrocarbon Processing - May 2022 - 73
Hydrocarbon Processing - May 2022 - 74
Hydrocarbon Processing - May 2022 - 75
Hydrocarbon Processing - May 2022 - 76
Hydrocarbon Processing - May 2022 - 77
Hydrocarbon Processing - May 2022 - 78
Hydrocarbon Processing - May 2022 - 79
Hydrocarbon Processing - May 2022 - 80
Hydrocarbon Processing - May 2022 - 81
Hydrocarbon Processing - May 2022 - 82
Hydrocarbon Processing - May 2022 - 83
Hydrocarbon Processing - May 2022 - 84
Hydrocarbon Processing - May 2022 - 85
Hydrocarbon Processing - May 2022 - 86
Hydrocarbon Processing - May 2022 - 87
Hydrocarbon Processing - May 2022 - 88
Hydrocarbon Processing - May 2022 - 89
Hydrocarbon Processing - May 2022 - 90
Hydrocarbon Processing - May 2022 - Cover3
Hydrocarbon Processing - May 2022 - Cover4
https://www.nxtbook.com/gulfenergyinfo/gulfpub/HPI-Market-Data-2023-v3
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2024-v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2024
https://www.nxtbook.com/gulfenergyinfo/gulfpub/gas-processes-handbook-2022_v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/gas-processes-handbook-2022
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hp_202212
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2023-v2
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hpi-market-data-2023
https://www.nxtbook.com/gulfenergyinfo/gulfpub/hp_202211
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202210
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202209
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202208
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202207_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202207
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202206_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202206
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202205_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202205
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202204_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202204
https://www.nxtbook.com/nxtbooks/gulfpub/hp_032022
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202203
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202202
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202201
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202112
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202111
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202110
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2022_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2022
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202109
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202108
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_processes_handbook_2021_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_processes_handbook_2021
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202107
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202106
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202105
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202104
https://www.nxtbook.com/nxtbooks/gulfpub/hp_ebooks
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202103
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202102
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202101
https://www.nxtbook.com/nxtbooks/gulfpub/catalyst_handbook_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/catalyst_handbook_2020
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202011
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202010
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2021
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202009
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202008
https://www.nxtbook.com/nxtbooks/gulfpub/refining_processes_handbook_2020
https://www.nxtbook.com/nxtbooks/gulfpub/refining_processes_handbook_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202007
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202006
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202005
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202004
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202003
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202002
https://www.nxtbook.com/nxtbooks/gulfpub/hp_202001
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201912
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201911
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2020_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2020
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201910
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201909
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201908
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201907
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201906
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201905
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201904
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201903
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201902
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201901
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018_v2
https://www.nxtbook.com/nxtbooks/gulfpub/petrochemical_2018
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201812
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hpimarket_2019
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201811
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201810
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201809
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201808
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201807
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201806
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201805
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201804
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201803
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201802
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201801
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201712
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201711
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201710
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201709
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201708
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201707
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201706
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201705
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201704
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201703
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201702
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201701
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2017mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201612
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201611
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201610
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201609
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201608
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201607
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201606
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201605
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201604
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201603
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201602
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201601
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201512
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201511
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201510
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2016mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201509
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201508
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201507
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2015tmsd
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201506
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201505
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201504
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201503
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201502
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201501
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201412
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201411
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2015mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201410
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201409
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201408
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201407
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014petrochemicalprocesses_v2
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014petrochemicalprocesses
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201406
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201405
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201404
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201403
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014calendar
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201402
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201401
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201312
https://www.nxtbook.com/nxtbooks/gulfpub/hp_2014mediaplanner
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201311
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201310
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201309
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201308
https://www.nxtbook.com/nxtbooks/gulfpub/hp_srsguide2013
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201307
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201306
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201305
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201304
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201303
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201302
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201301
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201212
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201211
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201210
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201209
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201208
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201207
https://www.nxtbook.com/nxtbooks/gulfpub/hp_srsguide2012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201206
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201205
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201204
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201203
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201202
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201201
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201112
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201111
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201110
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201109
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201108
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201107_srsguide
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201107
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201106
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201105
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201104
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201103
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201102
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201101
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201012
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201011
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201010
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201009
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201008
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201007
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201006
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201005
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201004
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201003
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201002
https://www.nxtbook.com/nxtbooks/gulfpub/hp_201001
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200912
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200911
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200910
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200909
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200908
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200907
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200906
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200905
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200904
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200903
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200902
https://www.nxtbook.com/nxtbooks/gulfpub/hp_200901
https://www.nxtbookmedia.com