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自由知識文化日曆/4月8日
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來自華夏公益教科書，面向開放世界的開放圖書
2011年4月8日，Safecast為其開發的硬體蓋革計數器的批次生產推出了眾籌活動。
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書籍：自由知識文化日曆
華夏公益教科書
