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Organize your PDF library with iTunes

lifehacker.com/240447/geek-to-live--organize-your-pdf-library-with-itunes

From the page

Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.

Using iTunes' Smart Playlists and its PDF support, you can build a document library where PDF's are automatically sorted into keyword-based lists.