The Fairbanks gold-placer region. Water supply of the Yukon-Tanana region, 1907-1908. Gold placers of the Ruby Creek district. Placers of the Gold Hill district. Gold placers of the Innoko district. - Prindle, L.; Katz, F.J.; Covert, C.; Ellsworth, C.E.; Maddren, A.G. (Bulletin, 1908)