Friedrich Engels
<a href="//commons.wikimedia.org/wiki/User:OwcaGierka" title="User:OwcaGierka">OwcaGierka</a> ; eldonisto <a href="//commons.wikimedia.org/wiki/User:Eugenio_Hansen,_OFS" title="User:Eugenio Hansen, OFS">Eugenio Hansen, OFS</a>
CC BY-SA 4.0
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