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

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b robot Adding: sw:Miaka ya 1840
b robot Adding: hif:1840s
Loidhne 38:
[[gan:1840年代]]
[[gv:1840yn]]
[[hif:1840s]]
[[hr:1840-ih]]
[[hu:1840-es évek]]