MICRO magazine (6502 related), who knows?

Hi Group, I was doing some work on my collection this weekend. In particular I was reviewing my MICRO magazines (that deal with the KIM, PET, and various 6502 systems). I noticed that the latest copy I have is issue #18. I was wondering if anyone knew if there were issues beyond this or if the name of the magazine changed into something else and I'm just not making the connection? By the way, in the range of issues #1-18, I am missing issues #15 & #16. I do however have duplicates of some of the other issues. If anyone has duplicates of those two issues, in good shape, and you're interested in trading, one-for-one, let me know which issues you need and I'll see if that's one of the ones that I have duplicates of. I should have noted which ones I have copies of but I forgot and they're not here with me. Jon