A catalog created by Magnus Manske https://mix-n-match.toolforge.org/#/catalog/817 either needs to be retired or the items URLs updated to use the format now used by the Smithsonian's website. All links return 404. Also works have a Linked Open Data URL of the format https://edan.si.edu/saam/id/object/1979.150 which is a different ID than used in the urls that break. Possibly the Property would need discussion too: Current link examples lead to https://americanart.si.edu/artwork/portrait-girl-21713 while the corresponding linked open data focuses on https://edan.si.edu/saam/id/object/1967.6.13 as highlighted https://americanart.si.edu/about/lod