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Sierra Leone Sierra (lớp tàu ngầm) Sierra Gorda Sierra de Ajusco-Chichinauhtzin Sierra Nevada (Hoa Kỳ) Sierra de Yeguas Sierra de Luna Sierra Bullones, Bohol Sierra Leone tại Thế vận hội SierroTài liệu tham khảo
WikiPedia: Sierra_Leone http://sbs.com.au/theworldnews/Worldguide/index.ph... http://www.hls-dhs-dss.ch/textes/f/F003464.php http://encarta.msn.com/encyclopedia_761563681/Sier... http://www.sierraleone.com http://aleph.nkp.cz/F/?func=find-c&local_base=aut&... http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://catalogue.bnf.fr/ark:/12148/cb153257703 http://data.bnf.fr/ark:/12148/cb153257703 http://www.idref.fr/083228942 http://id.loc.gov/authorities/names/n80125443