Category:1820 in Moscow
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Most populous urban areas of the world: Barcelona [ES] · Boston [US] · Chicago [US] · Hanoi [VN] · Hyderabad [IN] · Kolkata [IN] · London [GB] · Milan [IT] · Moscow [RU] · New York City [US] · Paris [FR] · Philadelphia [US] · Toronto [CA] · Washington, D.C. [US]
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