From the Fediverse: A 1883 public domain image of Yellowstone's Boiling Sulphur Spring @pdimagearchive@mastodon.social shared a stunning 1883 chromolithograph "Boiling Sulphur Spring, Crater Hills" by Thomas Sinclair and Son, sourced from the Twelfth Annual Report of the U.S. Geological and Geographical Survey of the Territories — a Yellowstone National Park volume now held by The Field Museum Library and the Biodiversity Heritage Library. This is exactly the kind of public-domain, open-science cultural artifact that 6529 celebrates: a 19th-century government survey, paid for by the public, whose imagery is now freely available to all. CC0-style free culture at its origin. https://mastodon.social/@pdimagearchive/117123250649367340