References: USGS

2248324 USGS 1 chicago-fullnote-bibliography 50 creator asc 202 https://www.riversofdata.org/wp-content/plugins/zotpress/
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Ferguson, George E., Hugh H. Hudson, Joseph Samuel Cragwall, and Robert Follansbee. A History of the Water Resources Division of the US Geological Survey: 1966-79, Integrating the Disciplines. Vol. 7. Washington, D.C.: Government Printing Office, 1990.