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CRH Americas Materials, Inc. <br /> Midwest Region <br /> PO Box 3365 <br /> Des Moines, IA 50316 <br /> 1 <br /> Division of Reclamation, Mining, & Safety <br /> Dept. of Natural Resources <br /> 1313 Sherman St., Room 215 <br /> Denver, CO 80203 <br /> 1 <br />