U.S. Geological Survey Bulletin

Richard Bartlett Taylor, Sherman P. Marsh, L. P. Gough, H. T. Shacklette, Rebecca J. Stoneman, J. L. Peard, C. S. E. Papp — 1986

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.