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U.S. Geological Survey Circular 1225--The Quality of Our Nation's Waters--Nutrients and Pesticides--contents page

Photo of Opal Creek drains one of the few protected old growth forest reserves remaining in the Willamette Basin, Oregon.  Photo by Dennis A Wentz
Photograph by Dennis A. Wentz
Dallas is reflected in the channelized Trinity River, Texas.  (Photograph courtesy of TEXAS HIGHWAYS Magazine. by Richard Stockton.  Used with permission.)
Photograph courtesy of TEXAS HIGHWAYS
Magazine. by Richard Stockton. Used with permission.)
Photo of a wheat field (photo courtesy of Don Breenemen, University of Minnestoa Agricultural Extension Service)
(Photograph courtesy of Don Brennemen, University of Minnesota Agricultural Extension Service)

U.S. Geological Survey
Circular 1225

 

U.S. Department of the Interior
U.S. Geological Survey

A hydrologic technician collects a water sample from Zollner Creek, Oregon, for analysis of nutrients and pesticides. (Photograph by Dennis A. Wentz)
Photograph by Dennis A. Wentz



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