The text of the article is mostly quite similar to that of the source (but not the Art collecting and Dumbarton Oaks section), with a few minor changes. The suspect text was all added (unsourced) on one day in 2011 ([1], [2]) by one editor, Wynkyn (no longer active), whose editing seems to have revolved around Dumbarton Oaks. Given that the doaks.org page has general references, copyvio is much more likely than a backwards copy, although the oldest archive of the doaks page on Bliss is only from 2013.
Article cleaned by investigator or others. No remaining infringement. MER-C 17:03, 23 March 2025 (UTC)