00886cam a22002771 4500 gs 68000188 DLC 20260227111422.0 710913s1968 dcub b 00010 eng c gs 68000188 //r892 U.S. Geol. Survey. Libr. DLC n-cn--- n-ust-- QE75 .C5 no. 553 TN490.M3 H56 Copy 2. 553/.462 Hewett, Donnel Foster, 1881- Silver in veins of hypogene manganese oxides, by D. F. Hewett. Washington [U.S. Geological Survey] 1968. iii, 9 p. map. 26 cm. Geological Survey circular 553 Bibliography: p. 8-9. Manganese ores Southwest, New. Manganese ores Canada. Ore deposits Southwest, New. Geological Survey circular ; 553. 30434 30434