Title supplied. Caption: "Group in front of the hookworm headquarters at Purification. In white, from left to right: The Microscopist (he is an expert in pouring castor oil with chenopodium down the throats of children), Inspector Munez, who is getting people to construct latrines with pits 15 feet deep, Dr. Sawyer, Dr. Rincon (in charge of the laboratory)".
Rockefeller Archive Center, Rockefeller Foundation records, photographs, box 81, folder 1638
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Rockefeller Foundation, “Hookworm headquarters in Purification, Colombia,” 100 Years: The Rockefeller Foundation, accessed May 1, 2017, http://rockefeller100.org/items/show/1708.