筛选
科学数据
统计数据
共检索到12条 ,权限内显示50条;
![](http://agri.nais.net.cn/resources/front/images/source_91.jpg)
United States Agriculture Data, 1840 - 2012;;Version 1
- 负责人:
- 关键词:
- DOI:
- doi:10.3886/icpsr35206.v1
- 摘要:
- of machinery. Most of the basic crop output data apply to the previous harvest year. Data collected also included the population and value of livestock, the numb
![](http://agri.nais.net.cn/resources/front/images/source_91.jpg)
United States Agriculture Data, 1840 - 2012;;Version 4
- 负责人:
- 关键词:
- DOI:
- doi:10.3886/icpsr35206.v4
- 摘要:
- of machinery. Most of the basic crop output data apply to the previous harvest year. Data collected also included the population and value of livestock, the numb