Jon Freeman indexed a huge number of Singing Together booklets here (click). The index says the song was in the Spring 1975 booklet, but it's not one that was transcribed in Jon's project and it's not one of the issues I have. Anybody have that booklet?
Our indexes show that the song is included in a large number of campfire and children's songbooks, but none is what I would consider to be an "authoritative source."
Some of the songbooks have theories that the "Zum Gali" chorus is Yiddish slang for "to Galilee." Not sure that I believe that.
-Joe-