Creator
- Mardon, Son and Hall.1
- Mark A. Stephens Ltd. (Trinidad)1
- Marken & Bielfeld, Inc. (Frederick, Md.)1
- Mason, C. B.1
- Mathews Art Service (N.Y.)1
- Mathews Post Card Service (N.Y.)1
- Maura, Frederic.1
- McClure, L. Van.1
- McClure, R. L.1
- Memphis Paper Co. (Memphis, Tenn.)1
- Meriden Gravure Company.1
- Milke, O.1
- Millar & Lang, Ltd.1
- Millar, Doug.1
- Miller & Chadbourne (Fond du Lac, Wis.)1
- Miller, Sam.1
- Moorer (Philadelphia, Pa.)1
- Mora, O. de la.1
- Morais, W. G.1
- Moseley, D. S. D.1