Conversation so far:
What did Yip Harburg do on Broadway?
In the 1940s, Yip Harburg wrote a series of book musicals with social messages.
Was Yip Harburg a writer for Finian's Rainbow?
Yip Harburg wrote the book and lyrics for Finian's Rainbow.
What did Yip Harburg do in Hollywood?
Harburg worked with composers Harold Arlen, Vernon Duke, Jerome Kern, Jule Styne, and Burton Lane, and later wrote the lyrics for The Wizard of Oz.

Question: Did he write the lyrics for anything else?
Self-contained rewrite: Did Yip Harburg write the lyrics for anything else besides The Wizard of OZ?