Professor Challenger

Robin Edizioni

Il mondo perduto-La bolla velenosa. Le avventure del Professor Challenger (Vol. 1)

Independently published

Professor Challenger Complete Collection: The Lost World | The Poison Belt | The Land of Mist | The Disintegration Machine | When the World Screamed | Original Edition Annotated

Wildside Press

The Professor Challenger Megapack: The Complete Series (English Edition)

Beelzebub Classics

Professor Challenger: The Complete Collection (English Edition)

PROFESSOR CHALLENGER: THE KEW GROWTHS AND OTHER STORIES: A Weird Science collection (English Edition)

Professor Challenger Series (English Edition)    

Books on Demand

Professor Challenger - Gesamtausgabe: Die vergessene Welt, Im Giftstrom, Das Nebelland, Als die Erde schrie, Die Desintegrationsmaschine (German Edition)

Centaur

Professor Challenger: The Complete Novels and Stories (English Edition)

apebook Verlag

Professor Challenger - The Complete Collection (ApeBook Classics 35) (English Edition)

PROFESSOR CHALLENGER: THE ISLAND OF TERROR: A Sequel to Conan Doyle's The Lost World (English Edition)