National Archives: links to state archives. Links to Presidential libraries. Holocaust related records
A libguide with archives in New England and Nearby States: https://uri.libguides.com/archives/ri
New Hampshire: UNH special collections. New Hampshire Historical Society (Concord)
Digital Public Library of America, Primary Source Sets
NYC Public Library Digital Collections EG, James Madison Papers
Wilson Center (international sources): Featured documents. All Topics.
Labor Archives: A list of American Archives on Labor history
Library of Congress Digital Collections: https://www.loc.gov/collections/
Massachusetts Historical Society Digital Collections: https://www.masshist.org/digital-collections
Project Gutenberg (out of print books) https://www.gutenberg.org/