http://dewey.info/scheme/edition/e23/ en
891.852 Polish drama
891.8527 Polish drama--1919-1989
891.85272 Polish drama--1919-1945 891.85273 Polish drama--1945-1989
http://dewey.info/scheme/edition/e22/ de
891.852 Polnische Dramen
891.8527 Polnische Dramen--1919–1989, . . .
891.85272 Polnische Dramen--1919–1945 891.85273 Polnische Dramen--1945–1989
Dewey Decimal Classification
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