1. Maps and preliminary interpretation of anomalous rock geochemical data from the Petersburg quadrangle and parts of Port Alexander, Sitka, and Sumdum quadrangles, southeastern Alaska Yale Public content 1990. 2002-06-01T04:00:00Z. 2004-04-05T13:47:03Z. Geological Survey (U.S.). The Survey ; For sale by Alaska Distribution Section ; Map Distribution. English. Public. Alaska and Petersburg Region.