1. Comparison of multiple-year analyses of clay mineralogy of the Copper River system and the Gulf of Alaska [microform] Yale Public content 1987. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey : [Books and Open-file Reports Section, distributed]. English. Public. Alaska, Copper River Region, and Alaska, Gulf of.