And 1854 by Édouard Ducpétiaux found that the average Belgian worker had to devote 65
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And 1854 by Édouard Ducpétiaux found that the average Belgian worker had to devote 65
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-21 from Wikipedia. The archived copy is preserved so this citation survives link rot.