- McKay, Read Jennings, author1
- McKinney, Henry, author1
- McNutt, W. F. (William Fletcher), 1839- , author1
- Medical Association of the District of Columbia.1
- Medical Society of Nova Scotia, author.1
- Meigs, J. Forsyth (John Forsyth), 1818-1882, author1
- Meigs, James Aitken, 1829-18791
- Michel, Charles E. (Charles Eugene), 1833-1913, author1
- Middlesex South District Medical Society (Middlesex County, Mass.), author.1
- Middleton & Warner (Firm)1
- Miller, Adam, 1810-19011
- Mills, Geo. A., author3
- Mississippi. Attorney-General's Office, author, addressee.1
- Mississippi. State Board of Health, author, addressee.1
- Mississippi. State Board of Health, author.5
- Mitchell, Clifford, 1854-1939, compiler, translator1
- Mitchell, S. Weir (Silas Weir), 1829-1914 author1
- Mohr, Charles, 1844-19071
- Morgan, Ethelbert C., author2
- Morse, Edward Sylvester, 1838-1925, author1