Authors: R.
- Mace, D. R. (David Robert) -
- Macfie, R. A. (Robert Andrew) 1811-1893
- Macfie, R. A. Scott (Robert Andrew Scott) 1868-1935
- MacKenna, Robert William 1874-1930
- Mackenzie, A. R. D. (Alfred Robert Davidson) 1835-
- Mackenzie, Kenneth R. H. (Kenneth Robert Henderson) 1833-1886
- Mackenzie, R. Shelton (Robert Shelton) 1809-1880
- Maclagan, Robert Craig 1839-1919
- Macquoid, Thomas Robert 1820-1912
- Madden, R. J. -
- Magoffin, Ralph Van Deman 1874-1942
- Mainer, R. Henry (Robert Henry) 1878-1965
- Major, Richard Henry 1818-1891
- Major, R. W. -
- Mallet, Robert 1810-1881
- Mallory, Richard P. -
- Malthus, T. R. (Thomas Robert) 1766-1834
- Manion, R. J. (Robert James) 1881-1943
- Manning, William R. (William Ray) 1871-1942
- Marcy, Randolph B. (Randolph Barnes) 1812-1887
- Marett, R. R. (Robert Ranulph) 1866-1943
- Markham, Clements R. (Clements Robert), Sir 1830-1916
- Markham, Violet R. (Violet Rosa) 1872-1959
- Marquand, E. R. -
- Marquis, Don 1878-1937
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