CLAYS OF EASTERN COLORADO.
Denver, CO 1915. Illus, 9x6", cloth, 353 w/index, ink inscription, minor cover spotting. Colorado State Geological Survey Bulletin 8. More
Denver, CO 1915. Illus, 9x6", cloth, 353 w/index, ink inscription, minor cover spotting. Colorado State Geological Survey Bulletin 8. More