The hiding of BASE the non-Google powerful search systems stops today.
INTRODUCING: BASE provides academic resources, boasts 340 million documents with Free access to full texts of 60% the documents
G is only one of many “Powerful Search Systems”
Google is powerful and its "hides" other search systems from us and we simply just don't know they existence of most of them.
Meanwhile, there are still a huge number of excellent searchers in the world who specialize in books, science, other smart information.
Keep a list of sites that until now you’ve never heard of!
base-search.net
BASE is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 340 million documents from more than 11,000 content providers. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library