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Lecture Notes in Mathematics (1997-present)
Mathematics and Statistics books from Springer (2009, 2011-present)
MATHnetBASE contains every math book published by CRC.
I have provided these links for people who want to browse current issues. If you are searching for all the articles on a particular topic, I recommend using MathSciNet or Current Index to Statistics.
Historical Math Monographs from Cornell University Library
Mathematical Literature from GDZ (Center for Retrospective Digitization, Göttingen)
Journal Citation Reports is the source for journal impact factors.