- Macdonald, Gordon A. (Gordon Andrew), 1911-19781
- Mapel, W. J. (William Jameson), 1922-1
- Marshall, C. H.1
- Martin, Helen M. (Helen Mandeville), 1889-19731
- Mast, Richard F. (Richard Frederick), 1931-1
- McAllister, James1
- McCulloh, Richard P.1
- McPherson, Benjamin F.1
- Miller, Ralph L. (Ralph LeRoy), 1909-19911
- Miller, Robert D. (Robert David), 1922-1
- Milstein, Randall L.1
- Minard, James P.1
- Missouri. Division of Geological Survey and Water Resources1
- Mixon, Robert B.1
- Moore, Frank B. (Frank Baker), 1912-1
- Moore, James Gregory, 1930-1
- Moore, Richard B. (Richard Beresford), 1945-1
- Morris, H. T. (Hal Tryon), 1920-1
- Morsches, Sara A.1
- Mudrey, M. G., cartographer1
GeoBlacklight version 4.1.0
