Soil profile (locality unknown, probably somewhere in the U.S.) representing the soil order ‘alfisol’ according to the USDA soil taxonomy
U.S. Department of Agriculture (USDA)
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<a rel="nofollow" class="external text" href="https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/class/maps/?cid=nrcs142p2_053590">Alfisols description</a>, Distribution Maps of Dominant Soil Orders, USDA website