<bdi><a href="https://en.wikipedia.org/wiki/en:Pierre-Joseph_Proudhon" class="extiw" title="w:en:Pierre-Joseph Proudhon"><span title="French politician, philosopher, anarchist and socialist (1809–1865)">Pierre-Joseph Proudhon</span></a>
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<a rel="nofollow" class="external text" href="https://archive.org/details/correspondanced08prougoog">Internet Archive &amp; University of Michigan</a>