2011_L10_Spodosol
Selley et al., 2004. Encyclopedia of Geology - Volume IV - S.pdf
Libro de Campaña para Suelos
Cap 3
Illustrated Guide to Soil Taxonomy
Collecting Samples for Reference or Characterization Analysis Michael A. Wilson Research Soil Scientist Soil Survey Research and Laboratory Lincoln, NE.
Hydric Soil Determination and Delineation by: Wade Hurt, USDA, NRCS, NSSC/University of Florida, Gainesville, FL and Victor Carlisle, University of Florida,
