I've wanted to own the accompanying book to the 1991 exhibition of the Los Angeles County Museum of Art / Art Institute of Chicago on the Nazis' "Entartete Kunst" collection for some time, but was held at bay by the hefty price tag of even second hand copies. For some reason, I had failed until now to discover this extraordinary resource:
the whole thing online, complete with essays, reproductions of the various works, artist biographies and a translated facsimile of the vile catalogue to the original exhibition. Gear!