An diofar eadar na mùthaidhean a rinneadh air "1840an"

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b robot Adding: hif:1840s
b robot Adding: sr:1840е
Loidhne 75:
[[sl:1840.]]
[[sq:Vitet 1840]]
[[sr:1840е]]
[[su:1840-an]]
[[sv:1840-talet]]