DAW Books, Collector's No. 228. First book publication, 1977. "Lost race" tale, first serialized in Blue Book magazine in 1937. This is the second of three books published by DAW collecting these stories; the other two are "Hawk of the Wilderness" (1976) and "Kioga of the Unknown Land" (1978).
Used availability for William L Chester's One Against a Wilderness
February 1977 : USA Mass Market Paperback