To order the report, write or call:

U.S. Geological Survey
Branch of Information Services
Box 25286
Denver, Colorado 80225-0286
1-800-435-7627

Request:

USGS Open-File Report 90-130
County-Level Estimates of Nitrogen and Phosphorus Fertilizer Use in the United States, 1945 to 1985
by Richard B. Alexander and Richard A. Smith

Copies are available for $2.25 in paper or $4.00 on microfiche (plus shipping and handling costs).