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This site focuses on historical and scientific journals from around the world. DOAJ stands for Directory of Open Access Journals, and has millions of articles from hundreds of countries in a vast quantity of different languages. Click to DOAJ logo to access the science and history from all over the world.
Making of America is a digital library of primary sources that revolve around the creation of the United States of America, like our founding documents and firsthand sources from those times. The site archives books and journals by scanning in the images, and access to this project is available through Cornell University [click here] and University of Michigan [click here].
Much like the previous digital library, National Archives houses many historical artifacts from photos to government records and more. The website has organized the variety of materials they offer into educator resources, founding documents, and a few more categories for easier browsing depending on what you're looking for. Anybody that is interested can also schedule to visit one of their museums or presidential libraries on the website. To visit the National Archives, click the logo.