Differences between the 1st and 2nd printings:
1. The color of the 1st printing is a slightly lighter shade of red.
2. The 1st printing has a full-page GDW ad on the inside back cover, which is blank in the 2nd printing.
3. The 2nd printing has a full-page Product List on the back cover, which is blank in the 1st printing.
4. The credits page for the 1st printing contains:
Printed by
Presto Print and Copy Center, Inc. (plus an address line)
First Printing June 1981
5. The credits page for the 2nd printing contains:
Printed by
Cummins Printing Company (plus an address line)
First Printing June 1981
Second Printing October 1981