Lugar de publicación
Some results of twenty years of cactus research PartII. Cactus and Succulent Journal (Los Angeles) 23(3): 81-88: 88 (1951a)
Referencias
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Backeberg (1951)
Backeberg, C. 1951a. Some results of twenty years of cactus research PartII. Cactus and Succulent Journal (Los Angeles), 23(3): 81-88