MacBride, J. Francis (1945–1950, 8 letters) MacBride, Mrs. Phillip Douglas (1955, 1 letter) Macedo, Dr. Carlos Morales (1947, 3 letters) MacIver, Ivander (1956, 2 letters) MacNeil, Alan (1948, 1 letter) Madison, Marshall P. (1953–1957, 28 letters) Maguire, Dr. Bassett (1957, 4 letters) Maheswari, Dr. P. (1947–1957, 7 letters) Malik, Nasor S. (1955, 2 letters) Mallory, George D. (1948–1949, 3 letters) Manning Seed Co. (1956, 1 letter) Markham, Mabel E. (1954, 2 letters) Marnier-Lapostolle, Julien (1956, 2 letters) Marguart, J.E. (1947, 2 letters) Marshall, W.H. (1957, 6 letters) Marshall, Dr. W. Taylor (1952–1953, 2 letters) Marston, Otis (1954–1955, 2 letters)