Henry Granger Knight (1878-1942) and unidentified woman (probably Nelly Dryden Knight) at the First International Congress of Soil Science conference in Washington, D.C., June 13-22, 1927. Knight was chief of the Bureau of Chemistry and Soils, U.S. Department of Agriculture, and was listed as attending the conference with his wife Nelly Dryden Knight.
Smithsonian Institution Archives, Accession 90-105, Science Service Records, Image #SIA2008-4882
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