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Roy L. Mayhew, Studies on Bovine Gastro-intestinal Parasites XV. The Length of Life of the Adult Nodular Worm and Hook Worm in the Calf, The American Midland Naturalist, Vol. 43, No. 1 (Jan., 1950), pp. 62-65
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R. L. Mayhew (1950) studied this question.
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