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IS-35 Selected References Related to Coalbed Methane in the Greater Green River IS-35 Selected References Related to Coalbed Methane in the Greater Green River, Piceance, Powder River, Raton and San Juan Basins
IS-32 Coalbed Methane Development in Colorado IS-32 Coalbed Methane Development in Colorado, September 1990
MS-15 Map and Discovery of Permitted Colorado Coal Mines MS-15 Map and Discovery of Permitted Colorado Coal Mines, 1981