Subject
- Harbors--Traffic control35
- Military architecture31
- Museums31
- Park rangers23
- Flags--United States20
- Flags16
- War memorials16
- Cemeteries14
- Gunpowder14
- Signs and signboards14
- Soldiers14
- Engineering drawings13
- Fire pot cooking13
- Powder magazines13
- Warehouses13
- Flagpoles12
- Catholic church buildings11
- Excavation11
- Truck-mounted cranes11
- Drawing10