. Pork-production . Swine. Plate XII. — Above, Litter of pigs containing a reversion in color, the product of mating Berkshire-Yorkshire parents; middle, Poland-China sow with litter of pigs by a Yorkshire boar; helow, Berkshire sow with litter of pigs by a Duroc-Jersey 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 Smith, William Wesley, 1878-; Craig, Robert Alexander, 1872-. New York : Macmillan

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920