The Gray Creatures (complete novel)
From Author Wars - https://authorwars.com/books/the-gray-creatures-complete-novel-1987379.html
Editions/Publications:
- Unknown. Doctor Death, March 1935 (Unknown, Zorro, Dell Publishing Co., $0.15, 128 pages, pulp, MAGAZINE)
- Unknown. Doctor Death, March 1935 (Unknown, Zorro, Adventure House, ISBN-10: 9781597986496, $14.95, 128 pages, Trade Paperback, Anthology)