Charles E. Bishop
North Carolina State College
The author is indebted to D. Gale Johnson and H. G. Lewis of the University of Chicago and to R. A. King, Q. W. Lindsey, and W. W. McPherson of North Carolina State College for helpful suggestions. The assistance of K. L. Bachman and R. W. Hecht of the BAE in supplying the author with data from unpublished sources is acknowledged.
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