Não informado. (1999). United States Geological Survey annual report. U.S. Geological Survey.
Chicago Style (17th ed.) CitationNão informado. United States Geological Survey Annual Report. Washington: U.S. Geological Survey, 1999.
MLA (8th ed.) CitationNão informado. United States Geological Survey Annual Report. U.S. Geological Survey, 1999.
Warning: These citations may not always be 100% accurate.