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Wikipedia: de.wikipedia.or ... https://de.wikipedia.org/wiki/Petermanns_Geographische_Mitteilungen
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Wikidata: www.wikidata.or ... http://www.wikidata.org/entity/Q1735186
KEEPERS link: catalog.hathitr ... https://catalog.hathitrust.org/Record/000681653
KEEPERS link: catalog.hathitr ... https://catalog.hathitrust.org/Record/008603458
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