File:王禎農書-授時指掌活法之圖.png
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![File:王禎農書-授時指掌活法之圖.png](https://upload.wikimedia.org/wikipedia/commons/thumb/7/72/%E7%8E%8B%E7%A6%8E%E8%BE%B2%E6%9B%B8%EF%BC%8D%E6%8E%88%E6%99%82%E6%8C%87%E6%8E%8C%E6%B4%BB%E6%B3%95%E4%B9%8B%E5%9C%96.png/800px-%E7%8E%8B%E7%A6%8E%E8%BE%B2%E6%9B%B8%EF%BC%8D%E6%8E%88%E6%99%82%E6%8C%87%E6%8E%8C%E6%B4%BB%E6%B3%95%E4%B9%8B%E5%9C%96.png?20160528111749)
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