C.P.L. Search for 'pb:Agricultural Research Service | United States Department of Agriculture '

Report of The Chief of The Bureau of Public Roads, 1938

USA 1938 . 72 , United States Department of Agriculture, Bureau of Public Roads, Washington Henry A. Wallace . Thomas H. Macdonald, Chief 23.

USA 1939 . 85 , United States Department of Agriculture, Bureau of Public Roads, Washington Henry A. Wallace . Thomas H. Macdonald, Chief 23.

USA Agricultural Research Service | United States Department of Agriculture 1967