- Lawrence A. Lang, Collector, West Virginia Land Records, 1865/1896, bulk 1867/18681
- Lorentz Family Correspondence, 1848/18571
- Lucy M. Hite of Marion County, Letters, 1879/18861
- Margaret M. Simon, Compiler, "Trips from Ohio to New Germany in Preston County, Virginia 1826, 1833, 1835", 1825/19861
- Mary Kelley and Jacob Hartman Letters, 1889/19521
- Melvin C. Snyder, Congressman, Papers, 1946/19531
- Methodist Episcopal Church, Oakland District, Records, 1895/19101
- Michael Anthony Cover, Collector, Papers, 1844/19021
- Michael K. Johnson, Collector, Papers, 1830/19581
- Morrison, Gross and Company, Records, 1917/19501
- Oren F. Morton (1857-1926) Papers, 1799/19261
- Papers regarding Early Settlers of Aurora in Preston County, 1788/1943, bulk 1820/19161
- Patrick J. Crogan (1856-1949) Papers, 1900/19301
- Preston County (W. Va.) Court Record Books, 1818/19451
- Preston County (W. Va.) Court Records and Miscellaneous Papers, 1775/19181