First edition. Cover by Kenneth Fagg and endpapers by Alex Schomburg. Quarto. 207pp. Near fine with light wear at the edges in about very good first issue dust jacket (15 titles on the rear panel) with toning at the spine, moderate edgewear and both internal and external tape repairs at all the folds. Inscribed by the author using both his names: ""For the Browns, Erik van Lhin and 'me too' Lester del Rey."" One of the author and editor's early juvenile books inscribed to Charles N. Brown, editor of *Locus* and his wife Marsha, who later married noted British sci-fi artist Eddie Jones. A nice association copy between two important and influential science-fiction editors.