Subjects
- Locks (Hydraulic engineering)1
- Milling machinery1
- Mills and mill-work1
- Mines and mineral resources1
- Mines and mineral resources -- West Virginia1
- Nicaraguan Canal (Nicaragua)1
- Petroleum industry and trade1
- Poetry.1
- Portland cement1
- Railroads - Chesapeake and Ohio Railroad.1
- Railroads - Norfolk and Western Railroad.1
- Science -- History1
- Steel1
- Surveyors and surveying.1
- Suspension bridges1