The biologic and economic assessment of the field crop usage of chlorpyrifos [microform] : first draft / submitted to the U.S. Environmental Protection Agency ; edited by John F. Witkowski, Susan P. Whitney, Thomas J. Kergel ; document prepared by the National Agricultural Pesticide Impact Assessment Program, U.S. Department of Agriculture (Technical bulletin ; no. 1832)
The biologic and economic assessment of the field crop usage of chlorpyrifos [microform] : first draft / submitted to the U.S. Environmental Protection Agency ; edited by John F. Witkowski, Susan P. Whitney, Thomas J. Kergel ; document prepared by the National Agricultural Pesticide Impact Assessment Program, U.S. Department of Agriculture