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<br />M <br />cr, <br />~ <br />N <br /> <br />c <br /> <br />UNITED STATES <br />DEPARTMENT OF THE INTERIOR <br />Oscar L. Chapman, Secretary <br /> <br />BUREAU OF RECLAMATION <br />Michael W. Straus, Commissioner <br />Leslie N. McClellan, Chief Engineer <br /> <br />BOULDER CANYON PROJECT <br />FINAL REPORTS <br /> <br />PART III-PREPARATORY EXAMINATIONS <br /> <br />Bulletin 1 <br /> <br />GEOLOGICAL INVESTIGATIONS <br /> <br /> <br />DENVER, COLORADO <br />1950 <br />