Formats
- Slides (photographs)21
- Slides.19
- Cartoons.18
- Stereographs.18
- Aerial photographs.17
- Cyanotypes.15
- College publications.14
- Videocassettes.14
- Web sites.14
- Paintings.13
- Interviews.12
- CD-ROMs.11
- DVDs.11
- Negatives.11
- Photograph albums.11
- Glass negatives.9
- Lantern slides.9
- Account books.8
- Audiotapes.8
- Black-and-white negatives.8