Changes

<pdf>File:Ribbon Test.pdf</pdf>

<pdf>File:Determining soil texture using -ribboning technique.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>

<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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