 | Dirks, Harlan J. (Harlan John), 1925- 4n | (2) |
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 | Dirks, Harlan J. (Harlan John), 1925- 4n; World pork trends / . : Foreign Agricultural Service, U.S. Dept. of Agriculture, 1968. | |
| Dirks, Harlan J. (Harlan John), 1925- 4n; Financing livestock exports / . : Foreign Agricultural Service, U.S. Dept. of Agriculture, 1967. | |
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