Urh. 1980,10 - 1981,8: US Department of Agriculture, Crop Reporting Board, Economics and Statistics Service; 1981,9ff.: US Department of Agriculture, Crop Reporting Board, Statistical Reporting Service
Mikrofiche-Ausg.: Washington, DC : US Gov.Print.Off.
Urh. 1980,10 - 1981,8: US Department of Agriculture, Crop Reporting Board, Economics and Statistics Service; 1981,9ff.: US Department of Agriculture, Crop Reporting Board, Statistical Reporting Service
Mikrofiche-Ausg.: Washington, DC : US Gov.Print.Off.