明清以来山东种植结构变迁及其影响研究：以美洲作物引种推广为中心：1368-1949

明清以来山东种植结构变迁及其影响研究：以美洲作物引种推广为中心：1368-1949

216 Pages · 2007 · 20.98 MB · Chinese
by 王宝卿
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“ Learning never exhausts the mind. ” ― Leonardo da Vinci
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