Google is so powerful that it “hides” other search systems from us. We just don’t kn0w the existence of most of them. Meanwhile, there are still a huge number of excellel’lt searchers in the world who specialize in books, sciel’lce, other smart information.
Keep a list of sites you never heard of.
www.refseek.com CLICK – Academic Resource Search. More than a billion sources: encyclopedia, monographies, magazines. www.worldcat.org – a search for the contents of 20 thousand worldwide libraries. Find out where lies the nearest rare book you need.
https://link.springer.com CLICK – access to more than 1 O million scientffic documents: books, articles, research protocols. www.bioline.org.br is a library of scientific bioscience journals published in developing countries.
http://repec.org CLICK – volunteers from 102 countries have collected almost 4 million publications on economics and related science.
www.science.gov CLICK is an American state search engine on 2200+ scientific sites. More than 200 million articles are indexed.
www.pdfdrive.com CLICK is the largest website for free download of books in PDF format Claiming over 225 million names.
www.base-search.net CLICK is one of the most powerful researches on academic studies texts. More than 100 million sc.ientific documents, 70% of them are free