*Paper read at Seattle meeting, June 1940; revised May 1941. The study was made under the direction of Prof. P. E. Church at the University of Washington.
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*Paper read at Seattle meeting, June 1940; revised May 1941. The study was made under the direction of Prof. P. E. Church at the University of Washington.
*Paper read at Seattle meeting, June 1940; revised May 1941. The study was made under the direction of Prof. P. E. Church at the University of Washington.