Biodiversity Heritage Library
Site maintenance lasting 1 hour is scheduled to begin at 5:00PM CST on September 16, 2014.
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Model of an Arizona gold mine.
By: Nichols, Henry W. - Field Museum of Natural History.
Publication info: Chicago:Field Museum of Natural History,1922.
Contributed by: University of Illinois Urbana Champaign
Subjects: Arizona Geological modeling Gold mines and mining Goudmijnen Modellen