Authors: H.
- Mills, Winifred H. (Winifred Harrington) 1885-
- Milman, Henry Hart 1791-1868
- Minchin, Harry Christopher 1861-1941
- Miner, William Harvey 1877-1934
- Minkowski, H. (Hermann) 1864-1909
- Minnigh, H. N. (Henry N.) -
- Mirabaud-Thorens, H. (Henriette) 1881-1943
- Mohlenbrock, Robert H. 1931-
- Monckton, Horace Woollaston 1857-1931
- Montague, H. Gordon -
- Montaut, H. de (Henri de) -1890
- Montgomerie, D. H. -1948
- Montgomery, D. H. (David Henry) 1837-1928
- Montgomery, Helen Barrett 1861-1934
- Moody, R. S. H. (Richard Stanley Hawks) 1854-1930
- Moon, James H. 1830-
- Moore, Bloomfield H., Mrs. 1824-1899
- Moore, Henry Charles 1862-1933
- Moore, Jane Newell 1857-1945
- Moore, R. H. -
- Morgan, J. H. (John Hartman) 1876-1955
- Morgan, M. H. (Morris Hicky) 1859-1910
- Morgan, Thomas Hunt 1866-1945
- Morgan, W. H. (William Henry) 1836-
- Morgenthaler, Hans 1890-1928
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