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John S. Andrews, T. B. Stewart, Gary V. Richardson, W. C. McCormick, Internal Parasites in Pigs in Southern Georgia: Acquisition by Suckling Pigs Raised on Temporary and Permanent Pastures and Grazed on Permanent Pasture after Weaning, The Journal of Parasitology, Vol. 56, No. 6 (Dec., 1970), pp. 1210-1217
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Andrews et al. (1970) studied this question.
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