Books by Jefferson County (Colo.):
Books in the extended shelves:
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Jefferson County (Colo.): Geologic control of supply and quality of water in the mountainous part of Jefferson County, Colorado (Colorado Geological Survey, Dept. of Natural Resources, State of Colorado, 1975), also by Warren E. Hofstra, Dennis C. Hall, Colorado Geological Survey, and Geological Survey (U.S.) (page images at HathiTrust)
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