She kept recompiling them, Joe, and there may be more if they were published after her death. I don't remember the Oak one, but maybe I just bought the Schroder (named after the Peanuts musician) ones. And there are songs of hers that aren't in any of the books, too. Does your Oak one have Andorra, or One Little Mouse (about the mouse that chewed through the cable at Reuters)? Had the F word in it. Shocking.
Blessings,
Barbara