Authors: Ro
- Mason, R. Hindry (Robert Hindry) -
- Mason, Robert L. -
- Massachusetts. General Court. Committee on Railways and Canals -
- Masson, Rosaline 1867-1949
- Mathews, R. H. (Robert Hamilton) 1841-1918
- Mathot, Rodolphe Edgard 1866-
- Matos, J. J. Rodrigues de -
- Maturin, Charles Robert 1780-1824
- Maunsell, Robert 1810-1894
- Maxwell, James Robert 1844-
- May, H. A. R. (Henry Allan Roughton) 1863-1930
- Mayo, Dermot Robert Wyndham Bourke, Earl of 1851-1927
- Mayreder, Rosa 1858-1938
- May, Robert 1588-
- Mazzini, Giuseppe 1805-1872
- McBride, R. E. (Robert Ekin) 1846-
- McCarthy, Robert John -
- McClymont, James Roxburgh -
- McColvin, Lionel R. (Lionel Roy) 1896-1976
- McConnell, James R. (James Rogers) 1887-1917
- McCourt, Robert Shepard 1890-
- McCraig, Robert -
- Mc Donald, R. D. (Roelof Daniel) 1873-1949
- McDowell, Robert Emmett 1914-1975
- McElroy, Robert McNutt 1872-1959
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