Yip Harburg was a friend of my late grand uncle. After my uncle's dath, I went searching for information on Harburg, I found a website opeated by Harburg's son. He was gracious enough to answer some questions. Since I have no record of the website's URL, I can only tell those of you who might be intersted that it may still exist and that his son answers questions from strangers.

Sourdough