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Subject
- active galactic nuclei26
- agn1
- apparent magnitude1
- astrometry24
- astronomical reference materials1
- astrophysical masers4
- bl lacertae objects9
- cataclysmic variable stars1
- catalogs13
- ccd photometry1
- correlation2
- earth (planet)1
- galaxies24
- galaxy classification systems1
- galaxy planes1
- gamma-ray astronomy4
- h i line emission1
- h ii regions1
- infrared photometry1
- interferometry10
