Estimates of agricultural-chemical use in counties in the conterminous United States as reported in the 1987 Census of Agriculture
This coverage contains estimates of agricultural-chemical use in counties in the conterminous 
United States as reported in the 1987 Census of Agriculture (U.S. Department of Commerce, 1989a). 
Agricultural-chemical use data are reported as either acres on which used, tons, or as a percentage of 
county area. …