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Solution of the Child Labor Problem

판 4개, 최신 판부터

Creative Media Partners, LLC, 2018, ISBN 9781377392134

Kessinger Publishing, LLC, 2007, 무선(페이퍼백), ISBN 9780548301463

Kessinger Publishing, LLC, 2007, 양장(하드커버), ISBN 9780548358757

Cornell University Library, 1913, 무선(페이퍼백), ISBN 9781429741231