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自由知识文化日历/2 月 25 日
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来自维基教科书，一个开放世界的开放书籍
1989 年的今天，GNU 通用公共许可证已发布。这是针对 EMACS、GCC 等以前特殊 GPL 的概括和分段版本...
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书籍：自由知识文化日历
华夏公益教科书
