Google Books
Google Books (previously known as Google Book Search and Google Print) is a service from Google Inc. that searches the full text of books and magazines that Google has scanned, converted to text using optical character recognition (OCR), and stored in its digital database.[1] Books are provided either by publishers and authors, through the Google Books Partner Program, or by Google's library partners, through the Library Project.[2] Additionally, Google has partnered with a number of magazine publishers to digitize their archives.[3][4]
please visit the link for more details
https://en.wikipedia.org/wiki/Google_Books