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  1. 1
    Philadelphia : Published by A.L. Hummel for the American Academy of Political and Social Science.
    v. : ill., maps ; 24-26 cm.
  2. 2
    Worcester, Mass., Clark University.
    v. ill., maps, tables, diagrs. 26 cm.
    Also available on microfilm from University Microfilms International.
    Also available via the World Wide Web to JSTOR subscribers.

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