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

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b robot Adding: kk:1840 жж.
Loidhne 36:
[[jv:1840-an]]
[[ka:1840-იანები]]
[[kk:1840 жж.]]
[[ko:1840년대]]
[[ksh:1840-er Joohre]]