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Covers the geology of North America from 1669 to the present and the geology of the rest of the world from 1933 to the present Major areas of coverage include areal geology, economic geology, engineering geology, environmental geology, extraterrestrial geology, geochemistry, geochronology, geophysics, hydrogeology and hydrology, marine geology and oceanography, mathematical geology, mineralogy and crystallography, paleontology, petrology, seismology, stratigraphy, and structural geology.