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Subjects
- Families -- Germany[remove]2
- College teachers1
- Color photography -- Research1
- Drawings (visual works)1
- Etchings (prints)1
- Families -- New York (State) -- New York1
- Lightning -- Research1
- Photographic prints1
- Photography, Stereoscopic1
- Photometry1
- Photomicrography1
- Physicists1
- Romanticism -- Germany1
- Sketchbooks1
- Theses1