Books by Dwight E. Younkin:
Books in the extended shelves:
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Younkin, Dwight E.: Care of the sow during farrowing and lactation (U.S. Dept. of Agriculture, Office of Governmental and Public Affairs, 1981), also by David C. England, Arnold Rose, Barry J. Steevens, Jerry Hawton, Hobart W. Jones, and United States. Dept. of Agriculture. Office of Governmental and Public Affairs (page images at HathiTrust)
Find more by Dwight E. Younkin at your library, or elsewhere.