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Abstract
Harry Hayward, N. W. Ayer & Son, 308 Chestnut Street, Philadelphia, Pennsylvania (May 4, 1932)
B. E. Pontius, Purdue University, Lafayette, Indiana.
M. E. Jaffa, University of California, Berkeley, California (June, 1931)
W. H. Forsyth, Connecticut Agricultural College, Storrs, Connecticut (September 30, 1930)
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