”Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites. Google Scholar helps you find relevant work across the world of scholarly research.” (Google)
Search the full text of books to find ones that interest you and learn where to buy or borrow them. Some books are available for full view (entire full text); others for limited preview, snippet view or with bibliographic information only. (Text from Google)
All documents available through Google Patents originate from the United States Patent and Trademark Office (USPTO), the European Patent Office (EPO), and the World Intellectual Property Organization (WIPO).