The Fantastic Conquerors (Les Conquérants de l'impossible) is the first Philippe Ebly's series, beginning in 1971. It is also the longest, with 19 novels (and 2 more that are yet to be published). It was first published in the famous Bibliothèque Verte collection (Hachette publishing), then partially reprinted by Degliame Publishing. In the 1990s, some titles were rewritten and actualized by Philippe Ebly himself and reprinted in the Bibliothèque Verte collection (revised). Source: Wikipedia (en)