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<br />e <br />ESPEY, HUSTON & ASSOCIATES, INC. <br />4.0 REFERENCES <br />Environmental Protection Agency. 1976. Quality assurance handbook for air <br />pollution measurement systems. EPA-600/9-76-005. EPA-0RD-EMSL-RTP. <br />Federal Register. 1979. Ambient air quality surveillance. 40 CFR 58, Vol. 44, <br />No. 92, pp. 27571-27604. <br />United States Department of the Interior. 1976. Final environmental statement, <br />North~vpst Colorado Coal. Bureau of Land Management. <br />w <br /> <br />H-21 <br /> <br />