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Did you know that nearly 75% of the articles hosted on Project Euclid are free and openly available?
 
Dozens of journals, books, and proceedings series on the site are entirely open access, including
 
Almost all of the other journals on Project Euclid become open access three or five years after publication, including journals in the Euclid Prime collection. Each title’s homepage includes an information box describing the access window.
 
Older scholarship in mathematics and statistics is still heavily used (according to Clarivate Analytics, both categories have a citing half-life of >10), and many of these journals go back over 50 years.
 
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