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E-print archive in various areas of physics, mathematics, nonlinear science, and computer science.

A digital collection of classics from the National Library of France.

Commercial solved-problem guides on various math topics in eBook format.

Commercial library of mathematics texts and articles from CRC/Chapman and Hall. Annual subscription required.

This site exists primarily to host on-line textbooks and other scholarly materials in mathematics or physics.

A free collection of interactive mathematics and science books. Requires free (Windows) software to read.