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Wad, oocumsnoe and character of. 53 Wall rocks, alteration of 46,49,82-83 Wells, R. C, on fonnation of tetrahedrite 37-38 Yankee Fork, description of 27, 78 gravels on 80 places on 50-^1,77,89 production of. 89 ore deposits of 30,54, 8(K-fQ age and genesis of 83 Yankee Fork district, access to 77 geology of 18,21,23,35^38,30-31,78-80 history (rf 77 location of 76-77 mines and prospects of &-9& ores of 81-82 production from 77-78 topography of 78 wall rocks of 8S-SS O - I... 3 bias 001 isa 3h*) Verify Ik pockets contain all sheets Verify }L sheet (s) in pocket / X. 