USGS Geologic Map: Geologic Map of the Mount Richthofen Quadrangle and the Western Part of the Fall River Pass Quadrangle, Grand & Jackson Counties, Colorado. Authentic original folding paper map published by the US Geological Survey in 1981.
USGS Geologic Map: Geologic Map of the Mount Richthofen Quadrangle and the Western Part of the Fall River Pass Quadrangle, Grand & Jackson Counties, Colorado. Authentic original folding paper map published by the US Geological Survey in 1981.