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2000 Mathematics Subject Classification  Classification used by Math Reviews (MathSciNet) and Zentralblatt MATH (ZMATH) and other math bibliographies.
ArXiv  Open eprint archive with over 100,000 articles in physics, 10,000 in mathematics, and 1,000 in computer science. (Formerly called xxx; free)
EMIS: Mathematical Journals  Full text of about 40 research journals (free).
Electronic Research Archive for Mathematics (The Jahrbuch Project)  A digital archive of the most important mathematical publications of the period 18681942 and a database based on the "Jahrbuch über die Fortschritte der Mathematik".
Front for the Mathematics ArXiv  Userfriendly interface to the mathematics arXiv, with over 10,000 research papers.
JStor  An online archive of multidiscipline journal articles in the most significant professional journals. Full images of old articles are provided free.
Journal Copyright Policy Gossip  Information from authors and publishers about the copyright policies of certain journals.
MATHDI/ZDM  Zentralblatt für Didaktik der Mathematik (Math Education Reviews).
MR Lookup  Bibliographic data from Math Reviews without the reviews (free).
MathSciNet  Math Reviews: AMS database of more than a million reviews and abstracts of math publications (requires subscription).
The Electronic Library of Mathematics  The Electronic Library of Mathematics is offered by the European Mathematical Society (EMS) in cooperation with FIZ Karlsruhe / Zentralblatt MATH. Online journals, article collections, and monographs in electronic form: access is free.
The Mathematics Preprint Server  A permanent web archive and rapid distribution medium for research articles. Preprints can be uploaded and removed. Email alerting service.
ZMATH  Zentralblatt für Mathematik: European database of over a million reviews and abstracts of math publications (requires subscription: limited free access).
