Other Search Engines

Refseek - Academic Resource Search. More than a billion sources: encyclopedia, monographies, magazines.

World Libraries - a search for the contents of 20 thousand worldwide libraries. Find out where lies the nearest rare book you need.

Springer - access to more than 10 million scientific documents: books, articles, research protocols.

Bioline is a library of scientific bioscience journals published in developing countries.

Science Gov is an American state search engine on 2200+ scientific sites. More than 200 million articles
are indexed.

PDF is the largest website for free download of books in PDF format. Claiming over 225 million names.

Base Search is one of the most powerful researches on academic studies texts. More than 100 million scientific documents, 70% of them are free

Purdue NW, List of Open Access Databases a listing of over 50 open access databases, journals, textbooks and ebooks.

Directory of Open Access Journals and Articles DOAJ is an online directory that indexes and provides access to high quality, open access, peer-reviewed journals.

JSTOR Open Access  Open and free content from JSTOR