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Food, Fuel, and shelter : a watershed analysis of land-use ; trade-offs in a semiarid region (Report of a conference on the Front Range of Colorado, May 20-22, 1976, Greeley, Colo.)/ Timothy D. Tregarthen
Tregarthen, Timothy D., (1978)
Government and politics in Colorado : an information source survey
Harmon, Robert B., (1978)
Yearbook of the State of Colorado
(1918)