SF Encyclopedia Picture Gallery

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 John W Duffield writing as Roy Rockwood. Bomba the Jungle Boy and the Hostile Chieftain; or, A Hazardous Trek to the Sea (New York: Cupples and Leon, 1934)

 John W Duffield writing as Roy Rockwood. Bomba the Jungle Boy and the Painted Hunters; or, A Long Search Rewarded (New York: Cupples and Leon, 1932)

 John W Duffield. The City Beyond the Clouds; or, Captured by the Red Dwarfs (New York: Cupples and Leon, 1925) as by Roy Rockwood

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