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If it helps this gemstone publishing site seems to list most (if not all) of the different versions: https://gemstonepub.com/price-guides/comic-book-price-guides/?sort=newest&limit=100&mode=1&page=1 Specifically, for #39, there appears to be: CB Item # Site description ---------- ----------------- HC 39/A HC Avengers 7.0 x 9.25 $35.00 TPB 39/A SC Avengers6.5 x 9.25 $30.00 (no cover, assuming you want both Avengers cover to be the same variation of A) HC 39/B HC Invaders 7.0 x 9.25 $35.00 (Captain America, Human Torch, Sub-Mariner) SC Invaders 6.5 x 9.25 $30.00 (Captain America, Human Torch, Sub-Mariner) Not in CB. Probably TPB 39/B SC Mass Market edition 6.5 x 9.25 $30.00 (the JSA with the yellow background) Not in CB. Same size as other SC, so probably TPB 39/C

Not a computer expert by any stretch, but... I was getting the "Unhandled Exception" warnings over and over, and was unable to run the Content Update after installing ComicBase 2023. On a whim, I went to File/File Tools, and ran "Optimize Database". I then requested the Content Update yet again, and... ComicBase is now updating! No idea if it really "fixed" the issue, but the update IS now processing without any digging, file moves or other manipulations. Worth a try! Good luck all!