The whole trove was found by one of the guys on Vinduro. Here are two Penton photos -- there are probably more but I haven't scoured the album.
(http://www.remate.cz/kominik/2010/pov2/slides/p38.jpg)
(http://www.remate.cz/kominik/2010/pov2/slides/p44.jpg)
Found Carl Cranke and Kevin Lavoie in other shots. Cool!
Jeff DeBell
Here is the link....
http://www.remate.cz/kominik/2010/pov2/index.html
Jeff DeBell
Thanks for the link Jeff. I especially like the picture of Promberger, #296 aboard the KTM 500 -- he looks like a giant compared to everyone else back then. Also like the Barry Higgins picture, #320 on the 77 Maico 450...I've got soft spot for Maico GS's (and a few in my garage!)
John Hubbard
Just a side note:
In 1977 a friend from Chattanooga came home with a new Macio he bought from Barry Higgins's shop in Georgia. Brand new motocross model with a GS motor. He said Barry told him he swapped motors with his ISDT bike.