- Massachusetts State House (Boston, Mass.)--Pictorial works.1
- Massachussetts--History--Civil War. South Carolina--History--Civil War.1
- Mathews family.1
- Matthews family.1
- McCants, Thomas M., 1828-1864--Death and burial.1
- McClellan, George Brinton, 1826-1885--Cartoons and caricatures.1
- McClellan, George Brinton, 1826-1885--Portraits.5
- McCrary, Matthew Calhoun, 1834-1908--Correspondence.3
- McDowell, Sue, fl. 18611
- McGee, John L., d. 1864--Correspondence.2
- McLaws, Lafayette, 1821-1897.1
- McLure, John William, 1831-1916--Correspondence.2
- Means, John Hugh, 1812-1862.1
- Medicine, Military--Confederate States of America--History.1
- Melton, Samuel Wickliffe, 1830-18991
- Melton, Samuel Wickliffe, 1830-1899--Correspondence.2
- Mengis, Herr1
- Middleton, Williams, 1809-1883--Correspondence.1
- Military camps--Virginia--Richmond.1
- Military hospitals--Confederate States of America.1