#1, c.October 1977
#2, c.March 1978
#3, c.late 1978
#5, c.April 1981
#6, c.August 1981
#7, c.October 1981
#8, c.early 1982
#NN, post mid 1982
The first three issues are regular/magazine-sized editions, the rest are digest-sized issues. #'s 7 and 8 are the taller digest-sized editions.
The dates noted above are approximations based on the little data to hand, and a little bit of informed guesswork too. I will update this information as it becomes available.
To the best of my knowledge this is the complete run of the series. There is scope for a #9 tall digest-sized edition to have been published but to this point I have not seen one.
The unnumbered issue at the end of the gallery is a digest-sized recycled reprint of #1. It is possible that other issues in the series were recycled.
As you can see via the link to #7, 10 years ago I owned a single issue of this series. The rest have been purchased over the last 4 years. They have been substantially more expensive over the last 2 years.