共 50 条
- [3] FUTURE OF UNITED-STATES BEEKEEPING AND UNITED-STATES AGRICULTURE [J]. AMERICAN BEE JOURNAL, 1986, 126 (04): : 273 - 275
- [4] SOME TRENDS IN CHANGES OF THE STRUCTURE AND LOCATION OF UNITED-STATES AGRICULTURE [J]. SOVIET GEOGRAPHY REVIEW AND TRANSLATION, 1963, 4 (03): : 30 - 38
- [7] IMMIGRATION AND UNITED-STATES AGRICULTURE [J]. AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS, 1994, 76 (05) : 1234 - 1234
- [9] PRODUCTIVITY OF AGRICULTURE IN UNITED-STATES [J]. RIVISTA DI POLITICA ECONOMICA, 1976, 66 (01): : 90 - 122