Subject
- Inventors.2
- Naval aviation.2
- Railroad tunnels.2
- Rosendahl, Charles E. (Charles Emery), 1892-1977.2
- African Americans--Songs and music.1
- Air pressure--Measurement--Equipment and supplies.1
- Aircraft industry.1
- Altitudes.1
- Automobiles--History--20th century.1
- Benediction.1
- Bloom, Sol, 1870-1949.1
- Building--New Jersey.1
- Canals.1
- Cascade Range.1
- Cascade Tunnel (Wash.)1
- Cement.1
- Cleaning.1
- Construction workers--New York (State)--New York.1
- Construction workers--United States.1
- Construction.1