- Mon Valley Green Space Coalition (Morgantown, W. Va.)1
- Mon Valley Model Railroad Club of West Virginia (Morgantown, W. Va.)1
- Mon Valley Sleep Center (Morgantown, W. Va.)1
- Mon Valley Tri-State Network (Morgantown, W. Va.)1
- Mon/Fayette Transportation Project--Periodicals.1
- Monongah Coal and Coke Company. Mine No. 2.1
- Monongahela Baptist Association.1
- Monongahela Building (Morgantown, W. Va.)1
- Monongahela Navigation Company--Periodicals.1
- Monongahela Power and Railway Company (Fairmont, W. Va.)1
- Monongahela Power and Railway Company (Fairmont, W. Va.)--Periodicals.1
- Monongahela River Railroad Company.1
- Monongahela River Trails Conservancy (Morgantown, W. Va.)1
- Monongahela Soil Conservation District (Morgantown, W. Va.)--Periodicals.1
- Monongahela Soil Conservation District (Morgantown, W. Va.)--Planning.1
- Monongahela Valley Coal Mining Institute (Morgantown, W. Va.)1
- Monongahela Valley Coal Mining Institute (Morgantown, W. Va.)--Congresses.1
- Monongahela Valley Traction Company.1
- Monongahela West Penn Public Service Company--Employees--Periodicals..1
- Monongahela and Ohio Packet Company.1
