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(revised 2013). Edited by J.Minch et al.
Originally published in the 1960s and updated in 1990, this popular map has been recast and updated again (2013) as the first in the new series. John Minch and workers from the various state surveys have added new interpretations where needed, and all the highways are current. This much simplified map represents an excellent picture of the regional geology of the Southern Rocky Mountains group of states (Colorado, New Mexico, Arizona, and Utah).