9390

• UCREFRP Catalog Number: 9390
• Author: Webb, R. H., T. S. Melis and R. A. Valdez.
• Title: Observations of Environmental Change in Grand Canyon, Arizona.
• USFW Year: 2002.
• USFW - Doc Type: 02-4080,
• Copyright Material: NO

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Webb and others-OBSERVATIONS OF ENVIRONMENTAL CHANGE IN GRAND CANYON, ARIZONA-
U.S. Geological Survey Water-Resources Investigations Report 02-4080

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