refseek.com |
A search engine for academic resources. Over a billion sources |
worldcat.org |
Search in the contents of 20,000 world libraries |
link.springer.com |
Access to over 10 million scientific documents: books, articles |
bioline.org.br |
A library of published biological science journals |
repec.org |
Volunteers from 102 countries collected almost 4 million contributions |
science.gov |
A U.S. government search engine for over 2200 scientific websites |
pdfdrive.com |
The largest free PDF book download website. Claim more than 225 million titles |
base-search.net |
One of the most powerful search engines for academic research texts. Over 100 million scientific articles, 70% of which are free |
primo.nlr.ru |
Rare archived books/codexs (Russian) |
loc.gov |
Over 100 thousand documents, texts, books, PDFs, codex's, etc |
history-fiction.ru |
Rare historical literatures |
academia.edu |
Historical literature and text |
holybooks.com |
The largest collection of high-quality sacred texts, holy books, spiritual texts as PDF ebooks |
lexicity.com |
A comprehensive index for ancient language resources |
eudocs.lib.byu.edu |
European History |