Subject
- Metal roofing1
- Military architecture31
- Military bases1
- Military maps1
- Military museums5
- Mills and mill-work2
- Mobile cranes1
- Monuments25
- Museum exhibits5
- Museums31
- Musicians1
- National Underwater and Marine Agency2
- National parks and reserves4
- Navies--Officers2
- Navy-yards and naval stations8
- Ordnance4
- Pacific Ocean1
- Painting59
- Park rangers24
- Parking lots8