McGee - San Francisco State Universityonline.sfsu.edu/jerry/geog810/2005/Depman/Harbor1989.pdfThe...
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McGee - San Francisco State Universityonline.sfsu.edu/jerry/geog810/2005/Depman/Harbor1989.pdfThe cañon-bottom is not always obdurate rock, but many consist of coarse fragmental debris