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Google Scholar

An excellent tool for scholarly search for all subjects. Explore related works, citations, authors, and publications. Links to free articles are available.

DOAB

A free resource for ebooks, providing thoundsands of academic and peer-reviewed ebooks. Easy for searching and downloading sources.

OATD

This is an index of over 2.4 million electronic theses and dissertations (ETDs). The full text of all papers lives on the original hosting site, usually the repository of the university that granted the degree.