There will be an auction of The Ken Avery collection in CT in October.It is listed by Aumann Auctions. Some neat cletracs,cats and wheeled tractors.I have viewed this collection,and will be attending. Some of the tractors up for auction can be seen on youtube. I love the cletrac 80 Bill in CT.
Some nice units there. Check out the YouTube links off the auction site. Love that 80!
Here's the link to that:
http://www.youtube.com/watch?v=I3-tG0PB7Bs