General view of a drillability apparatus with fertilizer hoppers, a starwheel, and rotating plate mechanism at an unidentified U.S. Department of Agriculture facility.

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;…

General view of a variety of tools used to handle radioactive substances and other materials at U.S. Department of Agriculture facilities. The tools are labelled with numbers, presumably corresponding to an…

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;…

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.

General view of an unidentified room at the U.S. Department of Agriculture's Agricultural Engineering Laboratory showing a drillability apparatus with fertilizer hoppers, a starwheel, and rotating plate mechanism.

General view of fertilizer storage piles supported between uprights at the U.S. Department of Agriculture's Agricultural Engineering Laboratory. Text accompanying the photograph notes that each row contained a full set…

General view of granulation equipment used at the U.S. Department of Agriculture's Agricultural Engineering Laboratory located in Beltsville, Maryland. This equipment is believed to have been used by chemist John O.…

General view of the Shell Corporation's oceanic barge, known as "Ammonia Mariner." The barge was used to transport approximately 50,000 tons of ammonia fertilizer each year from Pittsburg, California to storage…

General view of small-scale continuous granulation equipment used at the U.S. Department of Agriculture's Agricultural Engineering Laboratory.

General view of the Air Control Room at the U.S. Department of Agriculture's Agricultural Engineering Laboratory showing three bags of fertilizer in storage under three bags of sand.

General view of the trays used to expose fertilizer to humidity in the Air Control Room at the U.S. Department of Agriculture's Agricultural Engineering Laboratory.

General view of the drillability machine at the U.S. Department of Agriculture's Agricultural Engineering Laboratory showing the distribution of wet granular fertilizer as deposited by the Grether hopper.

Overhead view of the Ingalls Shipbuilding Corporation's Mid-South Big N barge showing several tankers and unidentified workers. This barge may have been used to transfer ammonia fertilizer between storage terminals.

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…