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https://wellcomecollection.org/works/f4savtm2/images?id=gktjkkun

Field sanitation : a manual for noncommissioned officers / by James Sprigg Wilson. | Wellcome...

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https://www.ndsu.edu/agriculture/extension/publications/between-field-tillage-and-planting-equipment-clean-and-sanitation

Between-field Tillage and Planting Equipment Clean-up and Sanitation | NDSU Agriculture

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