Columbia subject headings:
Petroleum--Asia, Central.
September 11 Terrorist Attacks, 2001.
United States--Foreign relations--1989-
War on Terrorism, 2001-2009.
Harvard subject headings:
Petroleum--Asia, Central.
September 11 Terrorist Attacks, 2001.
United States--Foreign relations--1989-
War on Terrorism, 2001-2009
Princeton subject headings:
Petroleum--Asia, Central.
September 11 Terrorist Attacks, 2001.
United States--Foreign relations--1989-
War on Terrorism, 2001-2009.