1. Distribution and abundance of tin, determined by spectrographic analysis, in nonmagnetic fraction of heavy-mineral concentrates from stream sediments, Petersburg area southeast Alaska [cartographic material] Yale Public content 1983. 2002-06-01T04:00:00Z. 2023-07-19T03:01:25Z. Geological Survey (U.S.). U.S. Dept. of the Interior, Geological Survey. English. cartographic image. Public. Alaska and Petersburg Region.