As the copyright to Les atlantes du ciel is credited to "Jean Birgé and Editions Métal", perhaps is Long a pseudonym for Birgé (self publishing under pseudonym was quite common at the time in french SF).
As the copyright to Les atlantes du ciel is credited to "Jean Birgé and Editions Métal", perhaps is Long a pseudonym for Birgé (self publishing under pseudonym was quite common at the time in french SF).