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Databases
ADS contains approximately 13.3 million records covering pre-prints, journal articles, conference proceedings, observatory reports and bulletins, NASA technical reports, and theses.
Publication coverage: 1991 - present (updated daily)
The arXiv database contains e-prints (working papers) in the fields of astrophysics, physics, mathematics and statistics, non-linear science, computer science, quantitative biology, quantitative finance, economics, and electrical engineering.