共 8 条
- [1] CLAWSON M, 1959, METHODS MEASURING DE
- [2] CRUTCHFIELD JA, 1962, LAND EC MAY, P145
- [3] CUSICK PJ, 1962, J FARM EC DEC
- [4] ECKSTEIN O, 1958, WATER RESOURCE DEVEL, pCH2
- [5] MCKEAN RN, 1958, EFFICIENCY GOVERNMEN, pCH8
- [6] TOLLEY GS, 1962, AM EC REV MAY, P459
- [7] [No title captured]
- [8] 1962, OUTDOOR RECREATION A