Collection
- Marcia de Garmo Loudoun County Development Collection, 1933-2008, n.d.135
- Martin L. Cook Photograph Collection ca. 1930- ca.19453
- Mary Carter Collection n.d., 1914-19153
- McGill House Photograph n.d.3
- Medical Register, Loudoun County Circuit Court 1912-19573
- Mediterranean Pass for Rising Sun1819-18242
- Melchoir M. Long Obituary and Notes 1864; 18932
- Middleburg Life Press Release Collection 1991-199230
- Miskel's Farm, 1863, n.d.2
- Mollie Brady Collection 1847-189313
- Moore/Gibson Land Indenture 18532
- Mount Hope Baptist Church Records 1835-19859
- Mount Zion Church of the United Brethren in Christ Collection, 1897-19105
- Mrs. Swan Photograph ca. 19002
- Mt. Zion Church Preservation Association, Inc. 1996-201017