Subject - Geographic
- Martinique.36
- Martinsburg, (W.V.)1
- Maryland2
- Maryland--Biography.1
- Maryland--History--Civil War, 1861-18652
- Maryland--History--Civil War, 1861-1865.1
- Maryland--Politics and government--1861-18651
- Maryland.1
- Marylebone (London, England)5
- Marysville (Calif.)2
- Maryville (Mo.)1
- Massachusetts--Fiction.1
- Massachusetts--History--Civil War, 1861-18651
- Massachusetts--History--Civil War, 1861-1865--Regimental histories.6
- Massachusetts--History--Civil War, 1861-1865--Registers.3
- Massapequa (New York)1
- Mauritania.1
- Maury County (Tenn.)2
- Maysville (Ky.)1
- McAlester (Okla.)1