Subjects: State by State (sorted alphabetically by title)
- Martineau, Harriet, 1802-1876 -- Travel -- United States
- Medals -- United States
- Medical personnel -- United States -- Correspondence
- Medical social work -- United States
- Medicinal plants -- Culture -- United States
- Medicinal plants -- United States
- Medicine, Military -- Confederate States of America -- History
- Mediums -- New York (State) -- Rochester
- Mentally ill -- Care -- New York (State) -- Utica
- Mentally ill -- Commitment and detention -- New York (State) -- History -- 19th century
- Mentally ill -- United States -- Biography
- Men -- United States -- Fiction
- Merchant marine -- United States
- Merchant marine -- United States -- History
- Methodists -- United States -- Biography
- Methodist women -- United States -- Biography
- Mexicans -- United States -- Social conditions -- Juvenile fiction
- Mexican War, 1846-1848 -- Regimental histories -- United States
- Mexican War, 1846-1848 -- Regimental histories -- United States -- Engineers
- Middle-aged men -- United States -- Fiction
- Migrant agricultural laborers -- United States -- Juvenile fiction
- Migration, Internal -- United States
- Military airships -- United States
- Military bases -- United States -- Fiction
- Military cadets -- United States -- Biography