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Subject
- quasars[remove]1,074
- redshifted351
- photometry310
- spectroscopy290
- active galactic nuclei259
- optical astronomy250
- radio astronomy201
- surveys188
- galaxies165
- radio sources156
- infrared photometry120
- line intensities120
- x-ray sources115
- bl lacertae objects111
- redshifted / redshift110
- sloan photometry108
- ultraviolet astronomy73
- gravitational lensing54
- radio galaxies54
- wide-band photometry50
