Operational characteristics of tractors driven by children on farms in the United States and Canada |
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Authors: | Marlenga B Pickett W Berg R L Murphy D |
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Affiliation: | National Children's Center for Rural and Agricultural Health and Safety, Marshfield Clinic Research Foundation, 1000 North Oak Avenue, Marshfield, WI 54449, USA. marlenga.barbara@mcrf.mfldclin.edu |
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