. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. Fig. 10.—Whence came this large bowlder? •' The glaciers brought it many miles from the north. The machine in the'background is a stone puller. (Wisconsin.). 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