027 Allgemeinbibliotheken, Archive, Informationszentren
027.5 Behördenbibliotheken
027.508 Behördenbibliotheken für Personengruppen 027.5093-027.5099 Behandlung nach einzelnen Kontinenten, Ländern, Ortschaften 027.573 USA. Library of Congress, . . .
Dewey Decimal Classification
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