United States. Central Intelligence Agency 
The 1992 CIA World Factbook [EPUB ebook] 

The World Factbook is produced annually by the Central Intelligence Agency for the use of United States Government officials, and the style, format, coverage, and content are designed to meet their specific requirements.
Information was provided by the Bureau of the Census, Central
Intelligence Agency, Defense Intelligence Agency, Defense Nuclear Agency,
Department of State, Foreign Broadcast Information Service, Maritime
Administration, National Science Foundation (Polar Information Program),
Navy Operational Intelligence Center, Office of Territorial and
International Affairs, United States Board on Geographic Names,
United States Coast Guard, and others.