General view of fertilizer trays on a suspension apparatus at an unidentified U.S. Department of Agriculture facility.
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“Fertilizer Trays at U.S. Department of Agriculture Facility,” 1950–1959. Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 4. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1544bp120.
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