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Ressource en sol --- Soil resources --- Gestion des ressources --- resource management --- Utilisation des terres --- land use --- Cartographie --- cartography --- Classification des sols --- Soil classification --- Conservation des sols --- Soil conservation --- History --- USA --- 631.473 <09> --- 631.47 <73> --- #ABIB:dd.Prof.R.Dudal --- Soil surveys--Geschiedenis van ... --- Surveying, classification and utilization of land. Soil profiles. Litter. Humus. Topsoil. Subsoil etc. Micropedology--Verenigde Staten van Amerika. VSA. USA --- Soil scientists --- Soil surveys --- History. --- United States. --- 631.473 <09> Soil surveys--Geschiedenis van ... --- 631.47 <73> Surveying, classification and utilization of land. Soil profiles. Litter. Humus. Topsoil. Subsoil etc. Micropedology--Verenigde Staten van Amerika. VSA. USA --- Natural resources surveys --- Pedologists (Soil scientists) --- Agriculturists --- Earth scientists --- Soil surveys--Geschiedenis van ..