Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
United States. Agricultural Research Service. Production Economics Research Branch and United States. Dept. of Agriculture,Generalized types of farming in the United States : including a list of counties in type-of-farming regions and subregions,,U.S. Dept. of Agriculture,1950,Agriculture information bulletin,,,,https://cir.nii.ac.jp/crid/1130282271932887680