Curson, Nicholas W. (1948, 1 letter) Curtis, Howard S. (1957, 2 letters) Dattman, Fernando (1952, 2 letters) Dalby, Dr. Lewis A. (1953, 1 letter) Daly, Kevin (1957, 3 letters) Darby, Lewis A. (1952, 3 letters) Darlington, Cyril D. (1950–1955, 3 letters) Davies, Ralph K. (1957, 5 letters) Davis, A. Russell (1948–1949, 16 letters) Davis, Edwin F. (1949, 3 letters) Day, George H. (1957, 3 letters) Dehnel, George S. (1956, 1 letter) Dennes, Dr. W. R. (1948, 1 letter) Dennis, Earl A. (1948, 1 letter) Descole, Dr. Horacio Raul (1949–1955, 7 letters) Desjardins, Paul R. (1950, 1 letter) Dibblee, Benjamin H. (1940, 2 letters) Dietterle, Mrs. George (1949, 2 letters)