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

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b robot Adding: eo:1840-aj jaroj
b robot Adding: zh-min-nan:1840 nî-tāi
Loidhne 66:
[[wa:Anêyes 1840]]
[[zh:1840年代]]
[[zh-min-nan:1840 nî-tāi]]