共 50 条
- [4] INTENSIFIED COW-CALF PRODUCTION OKLAHOMA AGRICULTURAL EXPERIMENT STATION RESEARCH REPORT, 1978, (NP-76): : 77 - 77
- [8] ECONOMICS OF COW-CALF PRODUCTION IN ALBERTA CANADIAN JOURNAL OF AGRICULTURAL ECONOMICS-REVUE CANADIENNE D ECONOMIE RURALE, 1988, 36 (04): : 821 - 836