1. Geochemical map showing the distribution and abundance of copper, lead, and barium in stream-sediment samples in the West Chichagof-Yakobi Wilderness Study Area, Sitka quadrangle, southeastern Alaska [cartographic material] Yale Public content 1981. 2002-06-01T04:00:00Z. 2023-01-07T04:01:23Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Alaska.