Bulletin, Edições 532-535

15 cents 50 cents A. H. Brooks Anvil Creek basin bedrock beds bench bowlders Bulletin 379 Bulletin 442 Bulletin 520 Cache Creek canyon Cape Nome Chandalar channel clay coarse coastal plain Coldfoot Dexter Creek dikes diorite district east Endicott Mountains Eocene F. H. Moffit feet flows G. C. Martin geologic glacial glaciers gold placers gold-bearing gravels Grand Central granite graphitic gravel deposits gravels greenstone Gulch hills intrusive Kigluaik group Kigluaik Mountains Koyukuk Koyukuk River L. M. Prindle Lake limestone Linda Creek lower Middle Fork mineral resources mining Mount Osborn mouth Myrtle Creek Nome group Nome River nuggets occur P. S. Smith pay streak placer gold Placer mining quadrangle quartz quartz veins Rampart reconnaissance sand schist sediments Seward Peninsula silts slates slopes Snake River surface Survey Susitna thickness third beach topographic tributary U. S. Geol upper valley Water supply Yentna Yukon Yukon-Tanana region