 | Agricultural laborers United States Statistics. | (3) |
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 | Variations in length of the farm workweek / . Sellers, Walter E. 1n Washington, D.C. : Economic Research Service, U.S. Dept. of Agriculture, 1971. | |
| The hired farm working force of 1971 : a statistical report / . McElroy, Robert C. (Robert Cecil), 1919- 4n Washington, D.C. : Economic Research Service, U.S. Dept. of Agriculture, 1972. | |
| Potential supply and replacement of rural males of labor force age, 1960-70 / . Bowles, Gladys Kleinwort, 1917- 2n Washington, D.C. : U.S. Dept. of Agriculture, Economic Research Service, 1966. | |
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