: I'd be very surprised if Bill Bush wasn't aware of this collection and didn't use it
: for his research into the writing of Greenback Dollar.
The book is very good at telling the story, and the chapter bibliographies note the sources, so it's a good bet the answer lays there.
As historians of a tight-knit group like the Kingston Trio, we are both lovers of their product, fans of their personalities and on-stage patter, and then startled as intimate bits of information bubbles up. Example: Marketed as "clean-cut", I was literally shocked to learn the guys had used grass and other chemicals during the era. The truth was far and away from what I'd come to accept. The business side was always down-played, too. Naive as we were during the period, we were led to believe these were three friends doing the good work of spreading great American music!
Bob has stated, "You don't rat out on your friends". I guess the guys were just regular people with normal human foibles. I don't think of it as uncovering stuff better unknown. I see it as completing a complex history of four, very lucky, very personable, talented guys who came together to have fun, and found out everyone wanted to have fun with them.