No surprise, there's also a book out; I found it when I should have been looking up something else, of course. It's: "Cadences: the jody call book, no.1" edited by Sandee Shaffer Johnson. Canton, Ohio: Daring Press, 1983. ISBN 0938936115 It's probably out of print, but the ISBN sometimes helps in getting interlibrary loans. I remember it being a good book on the subject.