The Library of Congress has an overwhelming amount of information, much of which is available online. With just a bit of effort, you can access and use this information with your classes. Jeff Dunn at the blog Edudemic has discovered a fantastic infographic to help us all understand the wealth of relevant, curriculum-aligned content available at our fingertips from the LOC. (Click on image to view larger.)
Teaching with the Library of Congress
Applewild Technology 