Subject
- Astronomical Observatories[remove]34
- Research Facilities34
- Astronomy28
- Science28
- Geodesic Conference, Nice, 188719
- Scientific Equipment10
- Architecture9
- Astronomical instruments7
- Architectural Types5
- Optical Devices4
- Dwellings3
- Photographic Types and Formats3
- Solar Eclipse observations (6 April 1875), 18753
- Stereographs3
- Telescopes3
- Architectural Elements2
- Houses2
- Libraries2
- Public Buildings2
- Cameras1