Apparently the first joint edition of both Poe's Pym and JV's Sphinx des glaces has been published in English, under the title Pym by Coachwhip Publications in 2008--using the 1897 English translation that was retitled An Antarctic Mystery.
There were previous editions of both books in the Fitzroy series, but much abbreviated, and a Penguin edition from 1975 that included a fragment of Sphinx.
I wonder if this is indeed the first such "complete" joint edition -- and if it is as unusual in other languages as in English?
Brian Taves