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1
Herndon, VA : The Association, 1994

Conference Proceeding Book
2
by Sloto, Ronald A.
Harrisburg, Pa. : Denver, Colo. : U.S. Geological Survey ; Copies of this report can be purchased from U.S. Geological Survey Books and Open-File reports Section, 1989

Book
3
by Pregracke, Chad, 1974-
Washington, D.C. : National Geographic, 2007

Book