636.4 S Smith, William Wesley, 1878-- Pork--production, with a chapter on the prevention of hog diseases, by R. A. Craig. New York, The Macmillan, 1920. xix,492p. Front., illus., xii pl., diagrs. 19cm (Half--title: The rural science, ed. by L. H. Bailey) On cover: Rural text-book series, L. H. Bailey, editor.