SF Encyclopedia Picture Gallery
Hinko Gottlieb. The Key to the Great Gate (New York: Simon and Schuster, 1947) [no published version of "Kljuc od veilikih vrate" has been sourced: English publication almost certainly trans by Fred DeWolfe Bolman and Ruth Morris from a Serbo-Croat manuscript: illus/hb/Sam Fischer]
Image courtesy of Clute Science Fiction Library at Telluride