by United States. Congress. Senate. Committee on Appropriations

1923

by United States. Department of Agriculture

1929

by United States. Bureau of Agricultural Economics

1930

by United States. Dept. of Commerce

1925

by National Education Association of the United States. Research Division

1930

by United States. Office of Education

1918

by United States. Office of Experiment Stations

1913

by United States. Bureau of Foreign and Domestic Commerce

1929

by United States. Bureau of Agricultural Economics

1928

by United States. Department of Agriculture

1918

by United States. Department of Agriculture

1928

by United States. Federal Extension Service. Division of Cooperative Extension

1917