https://commons.library.stonybrook.edu/egp/This is the basic site of the open-access
Essential Graduate Physics series of lecture notes and problems by Konstantin K. Likharev. The series consists of 4 parts (
Classical Mechanics,
Classical Electrodynamics,
Quantum Mechanics, and
Statistical Physics) and also
Front Matter, 2 appendices, and a list of references. There is neither fee nor registration. Problem solutions are also available for free, upon request.
The series is quite popular with students from more than 100 countries all over the world, with more than 20,000 file downloads during the past 12 months.
A merged pdf file of this series is available here on
Mobilism, but the linked
Academic Commons site also offers separate pdf files of each part, of each chapter, each Front Matter component, and both appendices – 56 files overall. Moreover, these files continue to be updated for problem additions and typo corrections.