File:Principien1872-071.png
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![File:Principien1872-071.png](https://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Principien1872-071.png/791px-Principien1872-071.png?20100327193320)
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Original file (1,552 × 1,176 pixels, file size: 25 KB, MIME type: image/png)