In 1924 the United States Geological Survey published Frank Wigglesworth Clarke and Henry Stephens Washington’s calculations of what the Earth’s crust is made of, element by element. Ermine Cowles Case’s 1926 Carnegie Institution study surveys where the vertebrates of the late Paleozoic lived, outside North America. John Weir’s 1929 Hunterian Museum monograph records Jurassic fossils collected in Jubaland, and a 1973 Egyptian bulletin turns to the sea, with oceanography and fisheries research and a section in Arabic.

Clarke and Washington’s 1924 United States Geological Survey study.

Ermine Cowles Case’s 1926 Carnegie Institution survey of the late Paleozoic outside North America.

John Weir’s 1929 Hunterian Museum monograph on fossils collected in Jubaland.

A 1973 bulletin of oceanography and fisheries research.
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