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1Published: Washington, D.C.: Resources for the Future: National Planning Association, 1990.
Sınıf Numarası: 338.1873/AGRBook -
2Published: [Washington, D.C.]: U.S. Dept. of Agriculture, Economic Research Service: [Supt. of Docs., U.S. G.P.O., distributor],
Sınıf Numarası: SureliSerial