. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 20 SOIL COMPOSITION, CLASSES AND TYPES courses, and, when the ice melted a new soil called ^'glacial drift^^ was laid down. Most of this ^'drift ^^ material was not carried. 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