共 43 条
- [1] AHEARN M, 1998, AGR PRODUCTIVITY US
- [3] Beale C. L., 1998, RURAL DEV PERSP, V13, P2
- [4] BEALE CL, 2000, RURAL CONDITIONS TRE, P39
- [5] BEALE CL, 1979, DEMOGRAPHIC ASPECTS
- [6] BENTLEY SE, 1989, AER625 USDA ERS S FA
- [7] BENTLEY SE, 1990, AER631 USDA ERS
- [8] Boehlje M., 1992, Agribusiness (New York), V8, P219, DOI 10.1002/1520-6297(199205)8:3<
- [9] 219::AID-AGR2720080303>
- [10] 3.0.CO