The digital collection from the Library of Congress has more than 138 million artifacts, making it the largest library in the world. The collection emphasizes US history, world history, art, and architecture. This makes it an excellent tool for social studies research papers.
For teachers, there are lesson materials. Search filters include common core and state content, by grade and subject area. The site also provides excellent guidance on the use of primary sources, and search results list available primary sources.
