http://dewey.info/scheme/edition/e23/ en
335.4309 History, geographic treatment, biography
335.430947 Marxism-Leninism--Eastern Europe
http://dewey.info/scheme/edition/e22/ de
335.4309 Geschichte, geografische Behandlung, Biografien
335.430947 Marxismus-Leninismus—Osteuropa, . . .
Dewey Decimal Classification
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