Raamatud Natural Resources Conservation Service
Keys to Soil Taxonomy (Eleventh Edition)
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Keys to Soil Taxonomy (Eleventh Edition)
Soil Survey Staff, U. S. Department Of Agriculture, Natural Resources Conservation Service
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National Forestry Handbook
United States Dept of Agriculture, Natural Resources Conservation Service
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Soil Survey Laboratory Methods (Soil Survey Investigations Report No. 42 Version 4.0 November 2004 ¿)
U. S. Department Of Agriculture, Rebecca Burt, Natural Resources Conservation Service
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National Forestry Handbook
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Soil Survey Information Manual (Soil Survey Investigations Report No. 45, Version 2.0. February 2011 )
Natural Resources Conservation Service, U. S. Department Of Agriculture
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