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Academic resource search engine. More than a billion sources: encyclopedia, monographies, magazines.
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One of the most powerful search engine in academic research texts. More than 100 million scientific documents, 70% of them are free.
The largest website for free download of books in PDF format. Claiming over 225 million names.
An American state search engine on 2200+ scientific sites. More than 200 million articles are indexed.
KJCMT Digital Library
