. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. Fig. 13.—The United States is divided into thirteen soil provinces and regions ^ ate the correlation of soil types and series. (Bureau of Soils BuL 96, 1913.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920