My uncle was a long-time friend of Yip Harburg. I was trying to get some informatin on the Internet and found a Harburg site. It is run by harburg's son. I sent him an e-mail message and he was kind enough to reply.
Anyone interested in the work of Hrburg shuold try to fond this site. It was a year or two ago so I can't remember the earl but since I found it using Google, I am sure that others will be able to do the same.
Hope this helps you find the "original" lyrics to a wonderful song.