In some countries (Italy, Spain, Portugal...) this book was attributed to and published as a book by Jules Verne.
In France it was published by Hetzel in 1869 under an authors penname of X. Nagrien.
The identitiy of the real author behind the penname X. Nagrien was unknown until 1966, when the Verne scholar Simone Vierne identified the author as Francois-Armand Audoin.
See also Prodigieuse découverte
