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WikiPedia: Lợn_Duroc http://www.nationalswine.com/industryreference/ind... http://www.ansi.okstate.edu/breeds/swine/duroc/ind... http://nnptntvinhphuc.gov.vn/index.php?action=deta... http://nnptntvinhphuc.gov.vn/index.php?action=deta... http://nnptntvinhphuc.gov.vn/index.php?action=deta... https://web.archive.org/web/20161022222207/http://... https://web.archive.org/web/20161022222810/http://... https://web.archive.org/web/20161022222931/http://...