 | Tariff. | (2) |
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 | Changes in import duties on tobacco in free world countries, 1957-1969 / by Albert B. Davis and Ione B. Boblitz. Davis, Albert Bartlett, 1904- 2n Washington, D.C. : U.S. Dept. of Agriculture, Foreign Agricultural Service, 1970. | |
| Preferential trade arrangements of foreign countries / . Chrisler, Donald. 4n Washington, D.C. : U.S. Dept. of Agriculture, Economic Research Service, 1968. | |
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