| Information requests |
| 689.01 | Improving content on photographic techniques |
| Examples |
| 689.02 | Examples of ambrotypes |
| 689.03 | Painted ambrotypes |
| 689.04 | Ambrotypes: Half the back removed to show positive and negative areas |
| 689.05 | Ambrotypes: Used as the basis for illustrations |
| Themes |
| 689.06 | Ambrotypes: Animals |
| 689.07 | Ambrotypes: Backgrounds |
| 689.08 | Ambrotypes: Military |
| 689.09 | Ambrotypes: Occupationals |
| 689.10 | Ambrotypes: Photographic studios |
| 689.11 | Ambrotypes: Photographica |
| 689.12 | Ambrotypes: Portrait |
| Advertisements |
| 689.13 | Ambrotypes: Advertisements |
| Cased photographs |
| 689.14 | Marketing: Cased photographs |
| 689.15 | Cased ambrotypes |
| 689.16 | Japanese ambrotypes |
| Stereo ambrotypes |
| 689.17 | Stereo ambrotypes |
| Contemporary |
| 689.18 | Ellen Susan: Soldier Portraits |
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