共 50 条
- [21] PROJECTED CLIMATIC ATLAS OF THE UNITED-STATES [J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 1946, 57 (12) : 1275 - 1276
- [23] THE UNITED-STATES AND MEXICO - CLINE,HF [J]. HISPANIC AMERICAN HISTORICAL REVIEW, 1965, 45 (01) : 129 - 131
- [24] GEOGRAPHY OF AGRICULTURE - THEMES IN RESEARCH - GREGOR,HF [J]. GEOGRAPHY, 1971, 56 (253) : 357 - 357
- [25] GEOGRAPHY OF AGRICULTURE - THEMES IN RESEARCH - GREGOR,HF [J]. JOURNAL OF GEOGRAPHY, 1971, 70 (06) : 382 - 383
- [28] GEOGRAPHY OF AGRICULTURE - THEMES IN RESEARCH - GREGOR,HF [J]. ECONOMIC GEOGRAPHY, 1971, 47 (03) : 462 - 463
- [29] CHANGES FACING UNITED-STATES AGRICULTURE [J]. AGRICULTURAL ENGINEERING, 1985, 66 (04): : 20 - 21
- [30] POLICY TOOLS FOR UNITED-STATES AGRICULTURE [J]. TEXAS AGRICULTURAL EXPERIMENT STATION BULLETIN, 1986, (1548): : 1 - 73