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Digital Public Library of America (DPLA)
The Digital Public Library of America (DPLA) aggregates descriptive information (metadata), as well as available thumbnail images for millions of items held in U.S. archives, museums and libraries and makes this information freely available to users. Items included at this site include manuscripts, photos, sound files, video files, books and more.
Directory of Open Access Journals
Directory of Open Access Journals (DOAJ) contains peer-reviewed, scholarly articles and publications compiled under an Attribute-Sharealike Creative Commons license. You can do simple or advanced searches, or browse the collection. Content is comprehensive, with no discipline or field restrictions.
DTIC Public Technical Reports
Simple and advanced searches are available. Place your search terms or string in the field or fields (for advanced search) to bring up the full-text results list. The majority of documents are in PDF format.