The Permo-Triassic formations, a world review. Sherlock, Robert Lionel, 1875-1948. Geology, Stratigraphic Permian. Geology, Stratigraphic Triassic. Paleontology Permian. Paleontology Triassic. QE674 .S48 550 SHP "List of works referred to": p. 329-348. London, New York, Hutchinson's Scientific and Technical Publications [1948] [1948] 1948 Text 367 p. eng