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Pehr Osbeck Pehr Evind Svinhufvud Pehrforsskalia Pehria Pehria compacta Pehrforsskalia conopyga Pehr Forsskål Perú Petr Čech PerthTài liệu tham khảo
WikiPedia: Pehr Osbeck http://lib.hku.hk/database/ http://ebook.lib.hku.hk/CTWE/B36599530V1/ http://ebook.lib.hku.hk/CTWE/B36599530V2/ http://www.ipni.org/ipni/advAuthorSearch.do?find_a... http://runeberg.org/laholmsp/0007.html https://books.google.com/books?id=OkkQAAAAYAAJ&pri... https://archive.org/details/dagbokofwerenost1757os... https://web.archive.org/web/20070613084039/http://... https://web.archive.org/web/20120216063014/http://... https://web.archive.org/web/20160325032108/http://...