Rockefeller, Nelson A. (1955, 2 letters) Rockefeller Foundation (1947–1951, 37 letters) Rodriquez D., Joaquin (1950, 1 letter) Rodriquez C., Rafael L. (1954–1956, 11 letters) Rodriquez B., Dr. Rafael S. (1953, 1 letter) Roeding, George C. Jr. (1948–1950, 5 letters) Roeth, G.L. (1952, 1 letter) Rogers, H.F. (1950, 2 letters) Rollins, Dr. Reed C. (1949–1956, 9 letters) Roman, Dr. Miguel Figueroa (1949, 2 letters) Roovers Bros., Inc. (1950–1951, 4 letters) Rosenberg, J. (1953, 1 letter) Rosenwald, A. (1950, 1 letter) Ross, Nancy (1956, 2 letters) Royal Botanic Gardens (1938–1956, 27 letters) Rudolf, Sig. (1950, 5 letters) Rudolph, Walter (1954, 2 letters)