Subjects
- Milling machinery1
- Mills and mill-work1
- Mines and mineral resources1
- Mines and mineral resources -- West Virginia1
- Newspapers.1
- Political campaigns1
- Portland cement1
- Propaganda, Soviet1
- Science -- History1
- Steel1
- Suspension bridges1
- Technology -- History1
- Truss bridges1
- Waterways1
- Wheeling Bridge (Wheeling, W. Va.)1