Part of the Astrophysics Data Facility of the Space Science Data Operations Office at NASA, the Astronomical Data Center provides astronomical catalogs and journal tables to the scientific community. The site includes nine data categories: Astrometric and Positional, Photometric, Spectroscopic, Cross Identifications, Combined and Derived, Miscellaneous, Nonstellar and Extended Objects, Radio Sources, and High-Energy Data. Users can search by keyword, author name, and year of publication; or browse by catalog category, journal title, and author name. The How to Find ADC Data link gives helpful information on using the database, making this already well-designed site easier than most to find specifically what you need.
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