http://dewey.info/scheme/edition/e23/ en
792.09 History, geographic treatment, biography
792.0973 Theater--United States
http://dewey.info/scheme/edition/e22/ de
792.09 Geschichte, geografische Behandlung, Biografien
792.0973 Theater—USA
792.097309041 Theater—USA—1900–1919
Dewey Decimal Classification
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