Authors: Ro
- Moton, Robert Russa 1867-1940
- Mountain, Plum Rocky -
- Mudie, Robert 1777-1842
- Multhauf, Robert P. 1919-2004
- Munro, Robert 1835-1920
- Murchison, Roderick Impey, Sir 1792-1871
- Murphy, Charles Royier 1884-
- Murphy, R. K. 1927-1952
- Murphy, Robert F. (Robert Francis) 1924-1990
- Murray, R. F. (Robert Fuller) 1863-1894
- Murray, Robert 1832-1910
- Murray, Rosalind 1890-1967
- Murray, Roy Irving -
- Murri, Romolo 1870-1944
- Musick, John R. (John Roy) 1849-1901
- Musil, Robert 1880-1942
- Myers-Funnell, Rozelle V. -
- Nash, Rosalind Nightingale 1862-1952
- Nassau, Robert Hamill 1835-1921
- Nathan, Robert 1894-1985
- National Sheet Metal Roofing Co. -
- Nauman, Mary D. (Mary Dummett) 1839-1920
- Naunton, Robert, Sir 1563-1635
- Naylor, Robert Anderton -
- Nemiroff, Robert J. -
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