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- Astronomical observatories41
- Landscapes24
- Observatory domes24
- Panoramas20
- Mountains19
- Astronomical instruments16
- Reflecting telescopes13
- Spectrometer4
- Astronomical photography3
- Comets3
- Halley's comet3
- Telescopes2
- Architecture1
- Bridges1
- Cities and towns1
- Landscape photography1
- Machine shops1
- Portraits1
- Rivers1
- Scientific apparatus and instruments1