1. Mineralogical map showing the distribution of selected minerals in nonmagnetic fraction of heavy-mineral concentrates from stream sediments, Petersburg area, Alaska [cartographic material] Yale Public content 1983. 2002-06-01T04:00:00Z. 2023-07-19T03:01:25Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Alaska and Petersburg.