The Petition

Careful research leads Standard Ebooks to believe that these images are free of copyright restrictions in the United States. You must do your own research to confirm their copyright status before using them. They may also still be under copyright in other countries. If you’re not located in the United States, you must check your local laws to verify that these images are free of copyright restrictions in the country you’re located in before accessing, downloading, or using them.

Metadata

U.S. public domain proof

Museum page

https://www.nga.gov/artworks/57651-petition