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"PDF books search engine" is a PDF finder, document search engine and text search engine on which you can find lots of PDF,ebooks,docs online and text documents.The results given by doc search engine is totally different from the normal search results that you can find on Google because it gives so many results at the same time ,So, may be you will get confused by looking that,that's why ebook search engine comes into picture,It searches the whole web for the PDF and gives back only PDF results.

ESE uses a beta version of Google Custom Search Engine to search over 23,000 economics websites and utilizes yolink to mine results and retrieve actionable, keyword-rich content. Results can saved to Google Docs, bookmarked or shared via major social networks. Each site is certified by RFE, which is run by economists from RePec Author Services and EDIRC."

"Search without being tracked. SearXNG is a free internet metasearch engine which aggregates results from more than 70 search services. Users are neither tracked nor profiled. Additionally, SearXNG can be used over Tor for online anonymity."