U.S. Geological Survey Bulletin

By L. P. Gough, Richard Bartlett Taylor, H. T. Shacklette, Rebecca J. Stoneman, J. L. Peard, Sherman P. Marsh, C. S. E. Papp

U.S. Geological Survey Bulletin
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Element concentrations in samples of eight types of produce are reported for collections taken before and after ash deposition, and the importance of compositional differences is assessed.

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