共 50 条
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- [5] The effect of energy on the adoption of conservation tillage in the United States ENVIRONMENTAL GEOLOGY, 1999, 37 (1-2): : 9 - 18
- [7] Factors affecting use of chiropractic services in seven midwestern states of the United States JOURNAL OF RURAL HEALTH, 1999, 15 (02): : 233 - 239