pdf/.epub/.djvu files) can be downloaded from: books about art or music, history or analysis of art."Teach yourself woodworking" and other self-teaching books.books on contemporary topics that discuss controversial issues of contemporary society, politics, economics, history, etc.
academic monographs, reference books, encyclopedias, conference proceedings, collected works, textbooks, or popular-level expositions on mathematics, science, engineering, medicine, linguistics, economics, history, philosophy, social sciences, and other academic disciplines.
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