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Ash, S. H., H. F. Yancey, O. E. Kiessling, Joseph Daniels, N. H. Snyder, L. N. Plein, A. C. Fieldner, H. M. Cooper, and F. D. Osgood. Analyses of Washington Coals In Bureau of Mines Technical Paper. Vol. 491. U. S. Department of Commerce, 1931.