The Greenberg AMK edition came out in 1998 - 128 pages
The 1st Schiffer edition(Green cover) in 2004 - 175 pages
The 2nd Schiffer edition(Blue Cover) in 2006 - 176 pages Marked 2nd Edition
The 3rd Schiffer edition (MOM Cover) in 2017 - 200 Pages Marked 3rd Edition
Each edition offers progressively newer information, Current values etc.
I got my Edition right from Tom and he autographed it for me, he's a very cool guy and I find all the books fascinating as it shows when values go up or down depending a lot on repops etc.... but Original kits always maintain a higher desirability and therefore higher value in most Aurora kits....
Denis