- Martinsburg Public Library (Martinsburg, W. Va.)--Periodicals.1
- Martinsburg Roundhouse Center (Martinsburg, W. Va.)1
- Martinsburg-Berkeley County Convention and Visitors Bureau (Martinsburg, W. Va.)1
- Mary Longsworth Antiques (Harpers Ferry, W. Va.)1
- Maryland Genealogical Society--Periodicals.1
- Maryland. Governor (1869-1873 : Bowie)1
- Mason Hospital (Clarksburg, W. Va.)1
- Mason-Union Protestant Nurse's Alumnae Association.1
- Masonic Research Society of West Virginia--Periodicals.1
- Masontown United Methodist Church (Masontown, W. Va.)1
- Masontown United Methodist Church (Masontown, W. Va.)--Directories.1
- Masontown United Methodist Church (Masontown, W. Va.)--History.1
- Massachusetts Emigrant Aid Company.1
- Masscon (Firm)1
- Master Marble Company (Clarksburg, W. Va.)1
- Masterpiece Crystal Outlet (Jane Lew, W. Va.)1
- Masterton Dulcimers (Walton, W. Va.)1
- Mates Creek District Primitive Baptist Association (Ky.)--Congresses.1
- Matewan Development Center (W. Va.)1
- Matewan Development Center (W. Va.)--Periodicals.1
