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We thank S. Sharpe tor sample collection; K. O'Brien, J. Betancourt, W. Broecker, and R. Dorn for helpful discussions; and C. Laj and one anonymous reviewer for their comments on the manuscript. Supported by NSF, the U.S. Department of Energy (DOE), and Los Alamos National Laboratory. Part of this work was supported and managed by DOE's Yucca Mountain Site Characterization Office. The record package containing traceability information is LA-CST-TIP-96-006.
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