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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.
Yancey, H. F., and M. R. Geer. Analyses and Other Properties of Oregon Coals as Related to their Utilization In Department of Geology and Mineral Industries Bulletin. Vol. 20. Oregon Department of Geology and Mineral Industries, 1940.