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Subject
- surveys6
- virtual-observatories5
- catalogs4
- photographic-photometry4
- sky-surveys4
- spectroscopy3
- active-galactic-nuclei2
- astrophotography2
- history-of-astronomy2
- broad-band-photometry1
- digital images1
- galaxy-clusters1
- galaxy-planes1
- milky-way-galaxy1
- objective prism1
- survey1
- variable-stars1
- virtual observatory1
- x-ray-astronomy1