Ed Summers suggested I share a Wikipedia user script I wrote last weekend at a library hackathon: https://en.wikipedia.org/wiki/Wikipedia:TWL/FindDPLA

Jake Orlowitz (Ocaasi) was a great help and made the awesome installation tour at the link above.

It's a bit of a work-in-progress but functions just fine; on each article you visit, it queries the Digital Public Library of America for relevant items and then lists out links up at the top. The biggest weakness is it won't load by default until you allow mixed HTTP/S content. The DPLA API is only available over HTTP and Wikipedia only over HTTPS.