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Detta verk är i public domain i Förenta staterna eftersom det publicerats före den 1 januari 1929.
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{{Information |Description ={{pt|1=O Dr. Lofgren estudando as formações xerophilas do nordeste brazilero.}} {{en|1=The Dr. Lofgren studying the xerophyle formations in Northeast Brazil.}} |Source =[http://archive.org/stream/recenseamento19...
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