Covers scholarly, government, and popular sources on all aspects of human impact to the environment, including: global climate change, green building, pollution, sustainable agriculture, renewable energy, recycling, and more. (EBSCO)
Search the full-text of millions of books. Use as a "discovery" tool to find books on your topic. Books in the public domain (generally, pre-1923) are available full-text. Newer books offer limited viewing--from many pages to nothing.Note: This is just for books (and some magazines). To find scholarly articles, use Google Scholar.
Enter words or phrases and graph their occurrences in publications over five centuries. Then browse the results using Google Books. Use it to compare shifting synonyms (junior high > middle school), or the growth of a new word (Internet).
Search for images using either words or another image (Reverse Image Search). To search by image, click on the camera icon and enter the URL for an image or you can drag and drop the image to the search bar. (Note: Unlike TinEye, you can't copy and paste an image to search.)
Project Vote Smart offers this introduction to how government works, including: How a Bill Becomes a Law, the President, Congress, Constitution, Elections, Campaign Finance, Budget, State Government, and more.
GovInfo provides free public access to official publications from all three branches of the Federal Government. If you are looking for a government document, this is a great place to start! A service of the United States Government Publishing Office (GPO).
A vellum copy offered with amazing color and detail. View beautiful close-ups of illuminations. Also provides an historic text describing how printers added illuminations to the texts. Excellent background information on the history of manuscripts and the development of the printing press.