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Locations of sampling sites. (A) Bench Glacier. Ice topography from a Global Positioning System survey (39) is shown, with shading where the topography was not determined. Contour intervals are 10 m on ice and 100 m off ice. (B) John Evans Glacier. The contour interval is 100 m on ice. Letters indicate sampling sites. A detailed description of the sampling sites is in Materials and Methods.
