Caption: "Dr. Weaver, Harrar, Peterson, Mr. M (translator)."
Rockefeller Archive Center, J. George Harrar papers, series 4, box 4, folder 38
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Rockefeller Foundation, “On route to Poland,” 100 Years: The Rockefeller Foundation, accessed March 23, 2017, http://rockefeller100.org/items/show/2764.