- M.H. Ross, Collector, Papers, 1930/19741
- M.H. Ross, Collector, Papers, 1931/19571
- Mason-Jackson Labor Council Papers, 1949/19771
- Max Mathers Collection Papers, 1821/19571
- Maxwell Family Papers, 1845/2017, bulk 1845/19501
- Milkint Brothers General Store (Tucker County, W.Va.), Financial Records and Photograph, 1912/19511
- Morgantown Rotary Club Papers, 1918/19561
- Morgantown Rotary Club Papers, 1918/19601
- Morrison, Gross and Company, Records, 1917/19501
- Mt. Clinton Telephone Company Ledger, 1916/19521
- New Monmouth Presbyterian Church records, 1776/19941
- Nicholas Marmion, Physician, Family Papers, 1798/19511
- Office of the Bursar Records, 1739/19871
- Ohio Valley Trades and Labor Assembly Records, 1888/19511
- Painters Local Union, No. 91, Wheeling, Records, 1886/19581