http://dewey.info/scheme/edition/e23/ en
514 Topology
514.3 Topology of spaces
514.32 Systems and spaces 514.34 Topological manifolds
http://dewey.info/scheme/edition/e22/ de
514 Topologie
514.3 Topologie von Räumen
514.32 Systeme und Räume 514.34 Topologische Mannigfaltigkeiten
Dewey Decimal Classification
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