Creator
- Letcher, John1
- Mackall, William Whann, 1818-18911
- Macleod, George H. B. (George Husband Baird), 1828-1892.1
- Manning, Samuel1
- Marsh, Catherine, 1818-1912.1
- Martyn1
- Massachusetts Prison Association.1
- Matthiessen, Frederic G.1
- McHollaway, Robert1
- McKinney, David1
- McLeod, James1
- Mead, Edwin D. (Edwin Doak), 1849-1937.1
- Meade Bros.1
- Mercer, Thomas J.1
- Miles, James Jefferson1
- Mingledorff, J. C.1
- Moffitt, A. J.1
- Moffitt, Milo1
- Morris, Emory T.1
- Morris, W. S. (William S.)1