Dan,
I'm still waiting for Mackey's book. Sad story involved: Jim Vornholt (designed several I-Beamers published in the 1970's - flew with Jack Sheets around Indianapolis...) accepted the job of handling PAMPA Sales. Then, at this year's Nationals, Jim slipped in the shower and broke a hip (or leg) and is still recuperating. I'm sure orders to PAMPA Sales have continued to gather - not everyone visits sites where Jim's injury was mentioned. Jim is solid good gold and dependable.
I expect the book will arrive as soon as conditions allow. The price is great, and the book will give you a lot of great info about tethered flying even before U-Control, as well as histories of our event's "founders."
I haven't forgotten, and hope to be able to get in touch "soon."