Book Searches

http://scholar.google.co.in

https://www.bookfinder.com/

https://cse.google.com/cse/home?cx=000661023013169144559%3Aa1-kkiboeco

https://books.google.com/advanced_book_search

https://www.usedbooksearch.co.uk/ for used books

http://www.isbnsearch.org/ search with ISBN

http://it-ebooks-search.info/ for IT books

http://www.bookfinder4u.com/

https://suvadi.cict.in/suvadi/search.php For Tamil Manuscripts