search engines

Here are some other search engines apart from Google!
Google is powerful, but they are many other best search engine systems either for education or other different purposes than google & bing.

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

Volunteers from 102 countries have collected almost 4 million publications on economics and related science.

Access to more than 10 million scientific documents: books, articles, research protocols.

Academic Resource Search. More than a billion sources: encyclopedia, monographs, magazines.

One of the most powerful researches on Academic studies texts. More than 100 million scientific documents, 70% of Them are Free.

An American state search engine on 2200+ scientific sites. More than 200 million articles are indexed.

A library of scientific bioscience journals published in developing countries.

A search for the contents of 20 thousand worldwide libraries. Find out where lies the nearest rare book you need.

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There are many huge number of excellent searchers engines in the world that specialize on books, science, other smart information.