ENCYCLOPEDIA OF THE SOCIAL SCIENCES. Vol.6. Edwin R. A. Seligman, editor-in-chief; Alvin Johnson, associate editor.
ENCYCLOPEDIA OF THE SOCIAL SCIENCES. Vol.6. Edwin R. A. Seligman, editor-in-chief; Alvin Johnson, associate editor. © 29Dec31; A46642. Macmillan Co. (PCW); 28Oct59; R244606.
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