The Los Chocoyos Ash, guatemala: A major stratigraphic marker in middle America and in three ocean basins, John W. Drexler, William I. Rose, R. S. J. Sparks, M. T. Ledbetter
William I. Rose

The Los Chocoyos Ash, guatemala: A major stratigraphic marker in middle America and in three ocean basins, John W. Drexler, William I. Rose, R. S. J. Sparks, M. T. Ledbetter
Department of Geological and Mining Engineering and Sciences Publications