1
Published: 1996
Superior document: US Geological Survey bulletin 2154
2
Published: 2002
Superior document: US Geological Survey professional paper 1657
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3
Published: 1997
Superior document: Professional paper / Geological Survey, United States, Department of the Interior 1580
4
Published: 1997
5
Published: 2004
Superior document: US Geological Survey professional paper 1684