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<br />TECHNIQUES FOR ESTIMATING SPECIFIC YIELD <br />AND SPECIFIC RETENTION FROM GRAIN-SIZE <br />DATA AND GEOPHYSICAL LOGS FROM <br />CLASTIC BEDROCK AQUIFERS <br /> <br />by S.G. Robson <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Water-Resources Investigations Report 93-4198 <br /> <br />Prepared in cooperation with the <br />COLORADO DEPARTMENT OF NATURAL RESOURCES, <br />DIVISION OF WATER RESOURCES, <br />OFFICE OF THE STATE ENGINEER and the <br />CASTLE PINES METROPOLITAN DISTRICT <br /> <br />Denver, Colorado <br />1993 <br /> <br />