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Cừu Marco Polo Cừu Merino Cừu mặt đen Scotland Cừu Maine đầu lam Cừu Manx Loaghtan Cừu mũi đen Valais Cừu Mông Cổ Cừu Magya Racka Cừu Manchega Cừu MoorschnuckeTài liệu tham khảo
WikiPedia: Cừu_Marco_Polo http://pages.usherbrooke.ca/mfesta/pdffiles/May-99... http://www.britannica.com/EBchecked/topic/33590/ar... http://discovermagazine.com/2008/mar/21-george-sch... http://books.google.com/?id=C2MtAAAAYAAJ&pg=PA44 http://books.google.com/?id=LWIrAAAAYAAJ&pg=PA100 http://books.google.com/?id=VS3cpjvLhf4C&pg=PT61&d... http://books.google.com/?id=aZAX4kT2qkQC&pg=PA253 http://news.nationalgeographic.com/news/2006/03/03... http://www.nationalgeographic.com/adventure/best-o... http://www.newstimes.com/news/article/Roxbury-s-Sc...