Ward, P. L., 1995, Subduction cycles under western North America during the Mesozoic and Cenozoic Eras: Geol. Soc. Special Paper 299, p. 1-45. Click here to download PDF
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Ward, P. L., 1991, On plate tectonics and the geologic evolution of southwestern North America: Jour. Geophys. Res., 96, p. 12479-12496. Click here to download PDF