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

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b robot Adding: br:Bloavezhioù 1840
b robot Adding: ms:1840-an
Loidhne 36:
[[ko:1840년대]]
[[lt:XIX amžiaus 5-as dešimtmetis]]
[[ms:1840-an]]
[[nl:1840-1849]]
[[no:1840-årene]]