Sweet Search is a search engine designed for students featuring results that have been reviewed by a team of educators and librarians. You are still responsible for checking the source credentials. NOTE: To locate your search results be sure to scroll past the initial sources labeled "Ad."
See the longer list for Generators, Fire Alarm Systems, and Residential Sound Systems (on Wakelet - no account needed)
Google Books searches the text of books and magazines that Google has scanned, converted to text, and stored in its digital database. Many results are not full text but you can often skim a few pages and find books that you could locate in libraries.