Machine guns--Maintenance and repair
Manufacturing industries--Ohio
Marion Power Shovel Company--History
Mather, William Gwinn (1857-1951)
Mathews, John Henry, 1785-1862
May 4 Shootings at Kent State University, 1970
McClellan, Ellen Marcy, 1838-1907
McClellan, George Brinton, 1826-1885
McClellan, George Brinton, 1826-1885--Family
McGuffey, William Holmes, 1800-1873
McKechnie, Deacon Bill, 1886-1965
McKenney, Thomas Loraine, 1785-1859
McKinley, William, 1843-1901--Pictorial works
McLaughlin, James W., 1834-1923
Medary, S. (Samuel), 1801-1864
Men--Ohio--Societies and clubs
Mental illness--Treatment--Ohio
Miami and Erie Canal (Ohio)--History
Miami University (Oxford, Ohio)--History
Military parades & ceremonies--1890-1900
Mills, William C. (William Corless), 1860-1928
Moorehead, Warren King, 1866-1939
Motion picture actors and actresses
Mound City Group National Monument (Ohio)
Mounds--Ohio--Montgomery County
Multicultural Ohio--Ethnic Communities
Multicultural Ohio--Ohio Women
Multicultural Ohio--Religion in Ohio
Mural paintings (visual works)
Murdoch, James Edward, 1811-1893
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