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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 |
| Institution: | 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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| 本文献已被 PubMed 等数据库收录！ | |