An interesting flea market find today was the 1937 Big Little Book by Conrad Vane, Doctor Doom, International Spy, Faces Death At Dawn (#1148). Looks like something from Sax Rohmer, doesn't it? The cover artists was Hal Arbo. Vane's character, Doctor Doom, was also featured in the 1939 Big Little Book, Doctor Doom, Foreign Spies, And the Ghost Submarine (#1460). The cover artist was Al McWilliams.