The first English language edition/printing of two albums in the great western bande dessinee series, written by Jean-Michel Charlier, with art by Jean "Moebius" Giraud.
The two albums are La longue marche (1980) and La tribu fantôme (1982): The Long March and The Ghost Tribe.
This series by Moebius spanned 28 books from 1963 to 2005.