. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. Fig. 192.—A stone dam is efifective in filling gullies. (Iowa Station.). Fig, 193.—Filling a bad gully by means of dams. (Iowa Station.). 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