Internet Modern History Sourcebook
Undoubtedly the most extensive collection of primary sources available online - from Colonial through the 21st century
- Digital Public Library of America: primary source sets
Wide range world history sources from ancient, medieval and modern time periods. The sets use letters, photographs, posters, oral histories, video clips, sheet music, and more.
- Digital State Archives
Access individual state archives. Includes (but not limited to) documents, photographs, videos, oral histories, music, deeds, artifacts, court records, slave emancipation records, newspapers, and military records.
- The Avalon Project
From Yale Law School-documents covering law, history and diplomacy from ancient times through the 21st century.
Free, digital history textbooks available in several areas such as environmental, local, general US history.
- The American Yawp
"A Massively Collaborative Open U.S. History Textbook" with primary sources organized by chapters.
Additional primary sources may be listed under the specific subject areas