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Reynolds 2008 | Raynolds, Robert G., ed. 2008. Roaming the Rocky Mountains and Environs: Geological Field Trips. Field Guide 10. Boulder, CO: Geological Society of America.
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Rocky Mountain News 1994 | Rocky Mountain News. 1994. Vanishing Colorado. Denver, CO: Rocky Mountain News.
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Roderick 1964 | Rodeck, Hugo G., ed. 1964. Natural History of the Boulder Area. Leaflet No. 13. Boulder, CO: University of Colorado Museum.
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