Alex Raymond. Flash Gordon in the Caverns of Mongo. New York: Grosset & Dunlap, 1936. First edition. Octavo. 218 pages. Jacket art and pictorial endpapers by Robb Beebe.Publishers original orange cloth with titles in black on the spine and frontMoreAlex Raymond. Flash Gordon in the Caverns of Mongo. New York: Grosset & Dunlap, 1936. First edition. Octavo. 218 pages. Jacket art and pictorial endpapers by Robb Beebe.Publishers original orange cloth with titles in black on the spine and front board.The first novel based on the strip.