- Marlow Seed Company (1)
- Matthews (2)
- Matthews, Glenn E (1)
- McCloy, C. H. (2)
- McConnell, Thomas C. (1)
- McGill-Warner Co. (2)
- McGreer Brothers (1)
- McPherson, J. L. (1)
- Mielziner, Leo, 1869-1935 (1)
- Miller, Kenneth Dexter, 1887- (4)
- Mills, W. P. (1)
- Minnesota Historical Society (2)
- Moe Studio (Photographer) (1)
- Mohler, Frank M. (1)
- Mott, John R. (John Raleigh), 1865-1955 (2)
- Munson, E. H. (1)
