Abstract
America in the Machine Age. By Louis Weinberg. New York: D. C. Heath and Company. 1932. Pp. vi + 346. Commercial Education in the High School. By Frederick G. Nichols, 1933. New York: D. Appleton‐Century Co. Pp. xxi + 514. Computing Diagrams for the Tetrachoric Correlation Coefficient. By Leone Chesirë, Milton Saffir, and L. L. Thurstone. 1933. Chicago: The University of Chicago. Pp. 360.

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