Question: What 24 comic album series created by Georges Remi featured a fifteenth volume named Land of Black Gold?
Sentence (from "Land of Black Gold"): After eight years, Hergé returned to "Land of Black Gold", completing its serialisation in Belgium's "Tintin" magazine from September 1948 to February 1950, after which it was published in a collected volume by Casterman in 1950.
Relevant evidence: No