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<pdf>File:Ribbon test.pdf</pdf>
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<pdf>File:Determining soil texture using -ribboning technique.pdf</pdf>
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<ref>From State of New South Wales through the Department of Trade and Investment, Regional Infrastructure and Services, 2014. A step-by-step approach known as the 'Ribbon Test" used to help assess soil textures in a collected sample with varying layers identified - as shown on https://www.dpi.nsw.gov.au/__data/assets/pdf_file/0005/164615/determining_soil_texture_using_-ribboning_technique.pdf</ref>
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