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

Chaidh 25 baidht a chur ris ,  9 bhliadhnaichean air ais
b
r2.6.5) (robot Adding: yo:Ẹ̀wádún 1840
b (r2.7.1) (robot Removing: ksh:1840-er Joohre)
b (r2.6.5) (robot Adding: yo:Ẹ̀wádún 1840)
[[vi:Thập niên 1840]]
[[wa:Anêyes 1840]]
[[yo:Ẹ̀wádún 1840]]
[[zh:1840年代]]
[[zh-min-nan:1840 nî-tāi]]
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deasachadh