First Printing April 1979
Second Printing July 1979
Third Printing August 1979
Fourth Printing October 1979
Fifth Printing November 1979
Sixth Printing December 1979
Seventh Printing January 1980
Eight Printing April 1980
Ninth Printing June 1980
Tenth Printing August 1980
Eleventh Printing September 1980
Twelfth Printing October 1980
Thirteenth Printing January 1981
Fourteenth Printing September 1981
Fifteenth Printing November 1981
This issue has variants: