- Marsh, Mae, 1897-1968--Portraits1
- Martin, Dr. Daniel Strobel, 1842-19251
- Martin, Samuel Maner, 1875-19591
- McCulloch, Dorothy, 1938-1
- Mexico--Maps1
- Microfilms1
- Middle Atlantic States--Maps--Early works to 18001
- Military cadets1
- Military music1
- Military music--United States1
- Military pensions--United States--Songs and music1
- Military readiness--Songs and music1
- Militia of Mercy (U.S.)--Songs and music1
- Miscellanea1
- Mississippi--Maps1
- Mollusks1
- Morris College (Sumter, S.C.)1
- Mothers of soldiers--Pictorial works1
- Mothers of war casualties--Songs and music1
- Murray, Elizabeth--Portraits1