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

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b robot Adding: jv:1840-an
b robot Adding: ksh:1840-er Joohre
Loidhne 36:
[[jv:1840-an]]
[[ko:1840년대]]
[[ksh:1840-er Joohre]]
[[la:Decennium 184]]
[[lt:XIX amžiaus 5-as dešimtmetis]]