The international scientific-educational website EqWorld presents extensive information on solutions to various classes of ordinary differential, partial differential, integral, functional, and other mathematical equations. It also outlines some methods for solving equations, includes interesting articles, gives links to mathematical websites, lists useful handbooks and monographs, and refers to scientific publishers, journals, etc. This site will be kept up to date to include new equations with solutions and other useful information.
I was looking for the textbooks on math and theoretical physics and found this web site with books in Russian in djvu frmat.
a bunch of printed material in Russian on ihtik
molecular physics books in russian