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2. Soil Survey of Merced Area, California;Arkley;U.S. Dep. Agric, Soil Surv.,1962
3. A coordinate soil classification based upon covarient soil properties (abstr.);Arkley,1978
4. A field morphology rating scale for evaluating pedological development;Bilzi;Soil Sci.,1977
5. Pedology, Weathering, and Geomorphologic Research;Birkeland,1974