1. Field guide to old ponderosa pines in the Colorado Front Range Publication/Creation: Fort Collins, CO : U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, [2003] Format: Book Access & Availability: Loading
2. Dakota group in Northern Front Range Foothills, Colorado Author/Creator: Waagé, Karl M. 1915-1999, (Karl Mensch), author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1955 Format: Book Access & Availability: Loading