- Maryland--Boundaries--Pennsylvania.1
- Maryland--Boundaries--West Virginia.1
- Maryland--Boundaries.1
- Mason County (W. Va.)--Biography.1
- Mason County Agricultural and Mechanical Association (W. Va.)1
- Mason, John W.1
- Mason-Dixon Line.1
- Matthews, John, 1772-1848.1
- McClellan, George B.1
- McKinley, William, 1843-1901.1
- Medicine--Societies, etc.1
- Medicine--West Virginia.1
- Memorial rites and ceremonies--West Virginia--Morgantown.1
- Mendel, Geo.1
- Mental health--West Virginia.1
- Mercer Healing Springs (Mercer County, W. Va.)2
- Mercer Healing Springs Hotel (Athens, W. Va.)2
- Merchant marine--United States.1
- Merchants and Manufacturers Association of Pittsburgh (Pittsburgh, Pa.)1
- Merchants--West Virginia--Fairmont--Periodicals.1
