Geologic and structure map of the Choteau 1 x 2 degree quadrangle, western Montana: a digital database.

Online link https://geo-nsdi.er.usgs.gov/metadata/map-i/1300/metadata.faq.html
Description The geologic and structure map of Choteau 1 x 2 degree quadrangle (Mudge and others, 1982) was originally converted to a digital format by Jeff Silkwood (U.S. Forest Service and completed by the U.S. Geological Survey staff and contractor at the Spokane
Originators Mudge, Melvill R.; Earhart, Robert L.; Whipple, James W.; Harrison, Jack E.; Munts, Steven R.; and Silkwood, Jeffery T.
Publication U.S. Geological Survey Miscellaneous Investigations Series Map I-1300

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