Creator
- M., C.1
- Marcolesco, Juan.1
- Mark A. Stephens Ltd. (Trinidad)1
- Marks (Chicago)1
- Mason Studios (Clarksdale, Miss.)1
- Mason, M. C. B. (Madison Charles Butler), 1859-1915.1
- Maura, Frederic.1
- Mazmanian.1
- McAdams, David.1
- McLe..., B...1
- McTaggart, I. A.1
- Meade Bros.1
- Metropolitan Photo (Boston, Mass.)1
- Milke, O.1
- Millar & Lang, Ltd.1
- Milwaukee Public Museum.1
- Mize, William J.1
- Moore, E. W.1
- Morsello, Joseph F.1
- Moss Photo (N.Y.)1