Subjects: RE (sorted alphabetically by title)
- M'Clintock, Francis Leopold, Sir, 1819-1907 -- Travel -- Arctic regions
- Mecklenburg (Germany : Region) -- Fiction
- Medicine, Chinese -- Formulae, receipts, prescriptions
- Medicine -- Formulae, receipts, prescriptions
- Medicine -- Religious aspects
- Medicine -- Religious aspects -- Christianity
- Medicine -- Research -- Fiction
- Mediterranean Region -- Description and travel
- Mediterranean Region -- Description and travel -- Juvenile fiction
- Mediterranean Region -- Guidebooks
- Mediterranean Region -- Poetry
- Mentally ill -- Family relationships
- Mental retardation
- Metamorphosis -- Religious aspects -- Poetry
- Methodist Church -- Relations -- Catholic Church
- Mexican-American Border Region -- Fiction
- Mexican-American Border Region -- Juvenile fiction
- Mexican War, 1846-1848 -- Regimental histories -- United States
- Mexican War, 1846-1848 -- Regimental histories -- United States -- Engineers
- Mexico -- History -- Revolution, 1910-1920
- Mexico -- History -- Revolution, 1910-1920 -- Fiction
- Mexico -- History -- Revolution, 1910-1920 -- Juvenile fiction
- Mexico -- Religion
- Michigan -- History -- Civil War, 1861-1865 -- Regimental histories
- Michigan, Lake, Region -- Fiction