A mud-sampling technique for the study of the ecology of aquatic snails, and its use in the evaluation of the efficacy of molluscicides in field trials*
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(1962). A mud-sampling technique for the study of the ecology of aquatic snails, and its use in the evaluation of the efficacy of molluscicides in field trials*. Bulletin of the World Health Organization, 27 (1), 125 - 133. http://www.who.int/iris/handle/10665/267622