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http://books.google.de/books?hl=de&lr=&id=Bvg99Qq54nUC&oi=fnd&pg=PR9&dq=%22Przewalski%27s+Horse.+The+History+and+Biology+of+an+Endangered+Species%22&ots=lpapHJfrtR&sig=gAa0F5kTNQWJz1RDSZ23aDjf1m4#PPA1,M1

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