Portrait of agricultural economist Gae Adamson Bennett (b. 1917). While working for the United States Department of Agriculture Economic Research Service, Bennett co-authored numerous volumes on agricultural production…

Group photograph of unidentified female personnel at an unidentified United States Department of Agriculture facility. A large board bearing a sheaf of wheat is visible in front of the group.

Photograph of mathematical physicist and physical chemist Richard C. (Chace) Tolman seated in front of a global map. This photograph is believed to have been taken when Tolman was serving as a scientific advisor to…

Group photograph of Fixed Nitrogen Research Laboratory personnel posed outside an unidentified facility. The Fixed Nitrogen Research Laboratory (F.N.R.L.) was established at American University in 1919 under the…

General view of a glassblower, identified as L. Testa, working in an unidentified U.S. Department of Agriculture facility. Per a 1931 list of technical workers in the Department of Agriculture, Testa worked as a…

Photograph of Milton Whitney (1860-1927), Chief of the Bureau of Soils, posed with a map of the United States and assorted scientific apparatus. Whitney served as the first Chief of the Division of Agricultural Soil,…

Portrait of Milton Whitney (1860-1927), Chief of the Division of Agricultural Soil (later alternately known as the Division of Soils and/or Bureau of Soils), a partner in the National Cooperative Soil Survey (NCSS).…

Portrait of Dr. Henry G. Knight, Chief of the U.S. Department of Agriculture's Bureau of Chemistry & Soils.

Group photograph of U.S. Department of Agriculture personnel at an unidentified facility. The individuals in the photograph are identified as follows:

Standing (left to right): Mr. Whittaker; Louise Gardner; J. R.…

Group photograph of U.S. Department of Agriculture personnel at an unidentified facility. The individuals in the photograph are identified as follows:

Standing (left to right): Richard Bradfield; S. S. Obenshain;…

Two views of the experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

The Fixed Nitrogen Research…

General view of the Engine Room at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. showing assorted machinery and apparatus.

The Fixed Nitrogen Research Laboratory…

Three views of the experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

The Fixed Nitrogen Research…

General view of unidentified employees opening the cinder-notch on the No. 2 experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen…

General view of an experimental blast furnace at a U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant. The Fixed Nitrogen Research Laboratory (F.N.R.L.) was established at American University in…

General view of the blowing out process for the experimental blast furnace at a Fixed Nitrogen Research Laboratory facility. The process of blowing out, also known as "raking out," is undertaken when production from a…

General view of the M.V. "Triaster" motor ship being loaded with phosphate at the cantilever located in Christmas Island, Nauru. This ship was managed by the British Phosphate Commissioners, a board of representatives…

Two exterior views of unidentified facilities believed to be associated with the U.S. Department of Agriculture.

General view of an unidentified analytical apparatus and technician at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The Fixed Nitrogen Research Laboratory…

Two aerial views of facilities believed to be associated with the U.S. Department of Agriculture.

Two aerial views of the U.S. Department of Agriculture complex located in Washington, DC. The second photograph was taken during the construction of the Administration Building and East and West Wings. The in-progress…

Three exterior views of unidentified buildings believed to be associated with the U.S. Department of Agriculture.

General view of U.S. Department of Agriculture personnel at an unidentified facility. Per a notation on the verso of the photograph, the individuals are identified (in no particular order) as follows: K.S. Love;…

Portrait of James Wilson (1835-1920), who served as Secretary of Agriculture from 1897 to 1913. Wilson's tenure as Secretary is regarded as a period distinguished by the modernization of agricultural methods, as well as…

U.S. Department of Agriculture exhibition display concerning fertilizer values as determined by per cent of plant food. The display includes several photographs of a range of agricultural crops, including wheat, cotton,…