Geologic Map of the Denver 1º x 2º Quadrangle, North - Central Colorado: Miscellaneous Investigations Series Map I-1163
U. S. Geological Survey, 1981. printed tan envelope, 12" tall, 2 folded maps, 1:250,000. DI2. More
U. S. Geological Survey, 1981. printed tan envelope, 12" tall, 2 folded maps, 1:250,000. DI2. More