Format
- Black-and-white photographs (46243)
- Slides (photographs) (22610)
- Digital images (16862)
- Maps (15544)
- Negatives (photographic) (10365)
- Newspapers (7407)
- Posters (5657)
- Aperture cards (5252)
- Educational events (5083)
- Radio programs (4932)
- Lantern slides (4180)
- Manuscripts (documents) (3568)
- Letters (correspondence) (3020)
- Color photographs (2227)
- Scrapbooks (2015)
- Illustrations (layout features) (1796)
- Reports (1518)
- Renderings (drawings) (1495)
- Oral histories (1356)
- Woodcuts (prints) (1265)
