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arXiv is a free distribution service and an open-access archive for 2,025,830 scholarly articles in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics.
MathSciNet® is an electronic publication offering access to a carefully maintained and easily searchable database of reviews, abstracts and bibliographic information for much of the mathematical sciences literature.
This collection of open scholarship created by faculty and students at the University of Maine is both searchable and browsable. Note that complete articles may be available here but complete books generally are not.