A lookup table mapping unique taxonomic Order, Suborder, Great Group and Subgroups to letter codes that denote their logical position within the Keys.
An object of class
data.frame with 3082 rows and 2 columns.
The lookup table has been corrected to reflect errata that were posted after the print publication of the 12th Edition Keys, as well as typos in the Spanish language edition.
Soil Survey Staff. 2014. Keys to Soil Taxonomy, 12th ed. USDA-Natural Resources Conservation Service, Washington, DC. https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/class/taxonomy/?cid=nrcs142p2_053580
Soil Survey Staff. 2014. Claves para la Taxonomía de Suelos, 12th ed. USDA-Natural Resources Conservation Service, Washington, DC. https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_051546.pdf