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外文期刊>The Canadian veterinary journal
>Studies on Colibacillosis of Calves: >II. A Clinical Evaluation of the Efficiency of Vaccination of the Dam as a Means of Preventing Colibacillosis of the Calf
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Studies on Colibacillosis of Calves: >II. A Clinical Evaluation of the Efficiency of Vaccination of the Dam as a Means of Preventing Colibacillosis of the Calf