- Lindvall, Robert M. (Robert Marcus), 1916-1
- Lineback, Jerry Alvin, compiler1
- Lipman, Peter W.1
- Lopez, David A.1
- M'Gonigle, John W.1
- Manitoba. Mineral Resources Division1
- Map Studio (Firm)1
- Maryland Geological Survey1
- Maxwell, Charles H. (Charles Henry), 1923-1
- McIntosh, Willard L.1
- McPherson, Benjamin F.1
- Minnesota Geological Survey1
- Monroe, Watson Hiner, 1907-19921
- Moore, William J. (William Joseph), 1938-1
- Morgan, W. C.1
- Morris, Leslie D.1
- O'Leary, Dennis W.1
- Ordnance Survey (Ireland)1
- Perlt, H.1
- Pomeroy, John S., 1929-1
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