Geology of Gunnison Gorge National Conservation Area, Delta and Montrose counties, Colorado [electronic resource] / prepared in cooperation with the U.S. Bureau of Land Management [by Karl S. Kellogg ... et al.].
Mode of access: Internet from the USGS web site. Address as of 10/7/04: http://pubs.usgs.gov/fs/2004/3050/gunnison%5Fscreen.pdf; current access is available via PURL.
