Rick Sieman, the famous superhunky from Dirtbike Mag has scanned all pages from the first years of DirtBike Magazine. He sell them as a CD set of 7 disks with all pages from all issues, 1971 - 1974.
I got my set the other day and it's well worth its money. If you have the money to spend (I know it's hard times) then I suggest that you contact him for your set.
superhunky[youknowwhat]gmail[dot]youknowwhat
(http://www.ktm495.mxbikes.com/rick_s.jpg)