Title supplied. Caption: "The 'balsa' or raft on which Dr. Wilson and Dr. Sawyer returned from Purification to Girardot down the Magdalena River. It is raining and the river is in flood. W.A.S. and two boatmen on the raft. The raft is made of banana stems tied together with vines".
Rockefeller Archive Center, Rockefeller Foundation records, photographs, box 81, folder 1638
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Rockefeller Foundation, “Wilbur A. Sawyer standing on a raft,” 100 Years: The Rockefeller Foundation, accessed April 30, 2017, http://rockefeller100.org/items/show/1707.