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中国之旅.俄国科学贸易考察团.Boiarskii.Adolf-Nikolay Erazmovich.摄影.1874-1875年 古籍古书网盘下载
这本《俄国科学贸易考察团的中国之旅》摄影集含139张照片。1874-1875年，俄国政府向中国派出一支科学贸易考察团，考察经由陆路调查中国贸易的增长前景，寻找合
几何原本. 第1-5卷 利玛窦 口述 徐光启 笔受 古籍古书网盘下载
《几何原本》（希腊语：Στοιχεῖα）又称《原本》。是古希腊数学家欧几里得所著的一部数学著作。它是欧洲数学的基础，总结了平面几何五大公设，被广泛的认为是历史上
