 | Johnson, Robert Wilton, 1930- 2n | (3) |
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 | Johnson, Robert Wilton, 1930- 2n; Operation of the PL480 program in Brazil / . Washington, D.C. : Development and Trade Analysis Division, Economic Research Service, U.S. Dept. of Agriculture, 1963. | |
| Johnson, Robert Wilton, 1930- 2n; Implications of European Community enlargement for U.S. tobacco exports / . : Foreign Agricultural Service, U.S. Dept. of Agriculture, 1973. | |
| Johnson, Robert Wilton, 1930- 2n; Italy's changing tobacco industry / . : U.S. Dept. of Agriculture, Foreign Agricultural Service, 1972. | |
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