- London Transport Board, cartographer, issuing body1
- Maine Geological Survey. Dept. of Conservation1
- Manitoba. Mineral Resources Division1
- McDowell, Robert C., 1935-1
- McElroy, Marianne1
- McGrath, P. H.1
- Moore, James Gregory, 1930-1
- Morris, E. C. (Elliot Cobia)1
- Morsches, Sara A.1
- Myers, Donald A., 1921-1
- Myrick, Robert M.1
- Nan Hua chu ban she1
- National Geographic Society (U.S.). Cartographic Division1
- Nelson, John B.1
- New Hampshire. Graphic Arts Section., cartographer1
- North American Metallogenic Map Committee1
- North Dakota Geological Survey1
- O'Neill, J. Michael1
- Otton, E. G. (Edmond George), 1918-1
- Oxford University Press1
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