It was first published in the December 1942 issue of the magazine Unknown .
It was first was first published in book form in paperback by Ballantine Books as the ninth volume of the Ballantine Adult Fantasy series in December 1969 .
It was first published in the December 1942 issue of the magazine Unknown , and was first published in book form in paperback by Ballantine Books as the ninth volume of the Ballantine Adult Fantasy series in December 1969 .