Le Cycle de Mars #2... but there's one missing?

I have found on the net a picture of the French edition cover of "Le Cycle de Mars tome 2", who will be published at the end of the year at the Omnibus editions:

The cover is in fact the right part of the one featured on the first volume. But what is embarrassing is that the last novel written by Burroughs seems to be missing: John Carter of Mars! So, yes, it was composed of two novelettes, one considered apocryphal, because it was written in fact by the son of Edgar Rice Burroughs (which didn't fool the readers at the time!), and the other one, whose action takes place on Jupiter, is unfinished because it would have been the first part of another cycle. Anyway, unfortunately, those who will buy the two volumes won't have the whole of John Carter's adventures, and that's too bad. The edition released by Lefrancq during the 90ies will stay the best published to date for the French readers!