- McCauley, John F.1
- McKee, Edwin D. (Edwin Dinwiddie), 1906-19841
- McKee, Edwin H.1
- Miller, Robert C.1
- Miller, Robert D. (Robert David), 1922-1
- Monroe, Watson Hiner, 1907-19921
- Moore, George E.1
- Moore, H. J. (Henry J.), 1928-1
- Moore, Samuel L.1
- Morris, E. C. (Elliot Cobia)1
- Morris, Robert H.1
- Myers, Donald A., 1921-1
- Noble, Donald C.1
- O.R.S.T.O.M. (Agency : France). Service cartographique1
- Offield, Terry W.1
- Olive, Wilds W. (Wilds Williamson), 1921-1
- Organization of American States1
- Outerbridge, William F.1
- Palmer, James Edward1
- Patton, William Wallace, 1923-1
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