I was wondering what you are using for your list of volumes in Les Voyages Extraordinaires? Wikipedia has this listed as #20
Mind you, I'm finding different publication order on English v French wikipedia entries:
http://en.wikipedia.org/wiki/Voyages_Extraordinaires
http://fr.wikipedia.org/wiki/Voyages_extraordinaires
D'oh! Just realized French and English publication might very well be in different order.