 | Ferguson, Walter L. 1n | (2) |
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 | Ferguson, Walter L. 1n; Hay harvesting practices and labor used, 1967, 48 states / . Washington, D.C. : Economic Research Service and Statistical Reporting Service, U.S. Dept. of Agriculture, 1971. | |
| Ferguson, Walter L. 1n; Farm labor used for fruits and tree nuts, 1964 / . Washington, D.C. : U.S. Dept. of Agriculture, Economic Research Service, 1969. | |
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