# List of catalog categories known.
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B=B. Copies of external databases, regularly updated.
I=I. Astrometric Data
II=II. Photometric Data
III=III. Spectroscopic Data
IV=IV. Cross-Identifications
V=V. Combined data
VI=VI. Miscellaneous
VII=VII. Non-stellar Objects
VIII=VIII. Radio and Far-IR data
IX=IX. High-Energy data
J.A+A=Astronomy and Astrophysics
J.A+AS=Astronomy and Astrophysics Supplement Series
J.AcA=Acta Astronomica
J.AJ=Astronomical Journal
J.AN=Astronomische Nachrichten
J.ApJ=Astrophysical Journal
J.ApJS=Astrophysical Journal Supplement Series
J.AZh=Astronomicheskii Zhurnal (Russian)
J.BaltA=Baltic Astronomy
J.PAZh=Pis'ma v Astronomicheskii Zhurnal (Astronomy Letters)
J.MNRAS=Monthly Notices of the Royal Astronomical Society
J.PASP=Publications of the Astronomical Society of the Pacific
J.PASJ=Publications of the Astronomical Society of Japan
J.other=publications from other journals
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