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<pdf>File:Ribbon Test.pdf</pdf>
<pdf>File:Ribbon Test.pdf</pdf>
<ref>Modified from S.J. Thien. 1979. A flow diagram for teaching texture by feel analysis. Journal of Agronomic Education. 8:54-55. as shown on https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/edu/?cid=nrcs142p2_054311 accessed 29 April 2019</ref>
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