Technical papers. 726. Carbonizing properties of thick Freeport and Pittsburgh coals from Pennsylvania, Elkhorn coal from Kentucky, and America and Mary Lee coals from Alabama, by J. D. Davis, D. A. Reynolds, B. W. Naugle, D. E. Wolfson, and G. W. Birge; Application of BN-AGA carbonization test results to byproduct practice, by C. H. Flickinger and J. P. Graham.