Classificació del sòl: diferència entre les revisions

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== Enllaços externs ==
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* [http://www.itc.nl/personal/rossiter/research/rsrch_ss_class.html A Compendium of On-Line Soil Survey Information - Soil Classification for Soil Survey by D. G. Rossiter]
* [http://fbe.uwe.ac.uk/public/geocal/SoilMech/classification/ Engineering soil description and classification] {{Webarchive|url=https://web.archive.org/web/20051015221621/http://fbe.uwe.ac.uk/public/geocal/SoilMech/classification/ |date=2005-10-15 }}
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