http://dewey.info/scheme/edition/e23/ en
917 Geography of and travel in North America
917.3 Geography of and travel in United States
917.304 Travel 917.306 Facilities for travelers
http://dewey.info/scheme/edition/e22/ de
917 Geografie Nordamerikas und Reisen in Nordamerika
917.3 Geografie der USA und Reisen in den USA
917.304 Reisen 917.306 Einrichtungen für Reisende
Dewey Decimal Classification
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