Authors: wal
- Mason, Walter George 1820-1866
- Massaguer, Conrado Walter 1889-1965
- Masterman, Walter S. (Walter Sidney) 1876-1946
- Matz, B. W. (Bertram Waldrom) 1865-1925
- Maunder, E. Walter (Edward Walter) 1851-1928
- Mayson, Walter H. (Walter Henry) 1835-1904
- McCaleb, Walter Flavius 1873-1967
- McClintock, Walter 1870-1949
- McConnell, Walter Caruth 1870-
- McDermott, William A. 1863-1913
- McRoberts, Walter -
- McSpadden, J. Walker (Joseph Walker) 1874-1960
- Migula, W. (Walter) 1863-1938
- Miller, Walter 1864-1949
- Miller, Walter M. 1923-1996
- Mills, Arthur Wallis 1878-1940
- Mills, W. W. (William Wallace) 1836-1913
- Molo, Walter von 1880-1958
- Montgomery, Walter A. (Walter Alexander) 1872-1949
- Moody, Walter D. (Walter Dwight) 1874-1920
- Moore, Walter W. (Walter William) 1857-1926
- Morgan, Wallace 1875-1948
- Morgan, Walter Jenks 1847-1924
- Morris, Mowbray 1847-1911
- Mostyn, Walter -
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