County-level estimates of nitrogen and phosphorus from commercial fertilizer for the conterminous United States, 1987-2006
By: by Jo Ann M. Gronberg and Norman E. Spahr
Contributors: Spahr, Norman E.; Geological Survey (U.S.); National Water-Quality Assessment Program (U.S.)
Series: Scientific investigations report -- 2012-5207
Publisher: U.S. Dept. of the Interior, U.S. Geological Survey
Published: 2012
Place of publication: Reston, Va
Language: eng
Format: [electronic resource] /
Number of pages: 20
Subjects: Nitrogen fertilizers; Phosphatic fertilizers
Notes: Title from title screen (viewed on Nov. 26, 2012).

"National Water-Quality Assessment Program."

Includes bibliographical references (p. 17-18).