http://dewey.info/scheme/edition/e23/ en
912 Graphic representations of surface of earth and of extraterrestrial worlds
912.73 United States--maps
http://dewey.info/scheme/edition/e22/ de
912 Grafische Darstellungen der Erdoberfläche und der Oberflächen außerirdischer Welten
912.73 USA—Karten, . . .
Dewey Decimal Classification
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