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Oas, AlbayTài liệu tham khảo
WikiPedia: Oas,_Albay http://www.oasnon.com http://www.t-macs.com/kiso/local/ http://elgu2.ncc.gov.ph/oas/ http://www.nscb.gov.ph/activestats/psgc/default.as... https://web.archive.org/web/20070311073610/http://...