Keokuk (Iowa), Illinois, Iowa, Minnesota, & Wisconsin. (1971). Surface water supply of the United States, 1961-65. United States Department of the Interior, Geological Survey.
Chicago Style (17th ed.) CitationKeokuk (Iowa), Illinois, Iowa, Minnesota, and Wisconsin. Surface Water Supply of the United States, 1961-65. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1971.
MLA (9th ed.) CitationKeokuk (Iowa), et al. Surface Water Supply of the United States, 1961-65. United States Department of the Interior, Geological Survey, 1971.
Warning: These citations may not always be 100% accurate.