Library of Congress: Free to Use and Reuse Sets

https://www.loc.gov/free-to-use

The Library of Congress is well known and loved for its vast online collections. Readers who find the library's digital enormity overwhelming, as well as those seeking royalty-free images, may appreciate these sets of copyright-free images and other content curated from the library's holdings. Here, visitors will find more than two dozen sets organized by theme, many of which are historical images and ephemera. The themes cover a diverse range of subjects, ranging from cats and dogs to Abraham Lincoln to roadside America, with several themes highlighting various types of historical posters. While most of the collections consist of photographs, documents, and other images, visitors will also find a collection of public domain films from the National Film Registry, as well as a vintage set of classic children's books that can be read online, including The Secret Garden and The Jungle Book. Because the "Library believes that this content is either in the public domain, has no known copyright, or has been cleared by the copyright owner for public use," the items featured in these sets have been deemed "free to use and reuse."

via https://scout.wisc.edu/archives/r50846/library_of_congress_free_to_use_and_reuse_sets