"The Abacus and the Cross"의 두 판 사이의 차이
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* http://www.dailymotion.com/video/xm8nij_osher-the-abacus-and-the-cross_lifestyle | * http://www.dailymotion.com/video/xm8nij_osher-the-abacus-and-the-cross_lifestyle | ||
* https://vimeo.com/84700838 | * https://vimeo.com/84700838 | ||
| + | * http://www.maa.org/publications/maa-reviews/the-abacus-and-the-cross-the-story-of-the-pope-who-brought-the-light-of-science-to-the-dark-ages | ||
[[분류:책]] | [[분류:책]] | ||