European & Asian Variations
Erdnase has been translated into at least six other languages besides English: Spanish, French, German, Italian, Japanese and Chinese.
There is a free Russian translation by Oleg Anatolievich Stepanov available online. This variation has the translator’s article on “Who was Erdnase” summarizing the mystery, with links to the rest of the book on his webpage. The site also includes a translation of Gardner’s introduction to the Dover edition.
It has also been reported that a Scandinavian version (Danish or Swedish) is also in preparation.
As far as I can tell, most and perhaps all of the foreign language editions exist in at least two publishing variants, although the variations can be extremely minor in some cases.
A nice addition to some of the foreign language versions are that several have prefaces by Roberto Giobbi; and introductions in the Spanish version by Juan Tamariz and in the Italian version by Steve Forte.
END of section