Nonpoint and point sources of nitrogen in major watersheds of the United States
Subtitle: introduction
By: by Larry J. Puckett
Contributors: Geological Survey (U.S.)
Publisher: U.S. Dept. of the Interior, U.S. Geological Survey
Published: 1994
Place of publication: [Reston, Va.?]
Language: eng
Subjects: Nonpoint source pollution -- United States; Water -- Nitrogen content -- United States; Water -- Pollution -- United States -- Point source identification
Other titles: National Water-Quality Assessment
Notes: Caption title

At head of title: National Water-Quality Assessment

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