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

Chaidh 37 baidht a chur ris ,  14 bhliadhnaichean air ais
b
b (robot Adding: bs, ca, cy, da, de, el, es, et, eu, fi, fr, hr, hu, io, is, it, ja, ko, lt, nl, no, pl, pt, ro, ru, scn, simple, sk, sl, sq, sv, tt, uk, wa, zh)
b (robot Adding: als:1840er, nrm:Annaées 1840)
[[category:1840s|*]]
 
[[als:1840er]]
[[bs:1840te]]
[[ca:Dècada del 1840]]
[[nl:1840-1849]]
[[no:1840-årene]]
[[nrm:Annaées 1840]]
[[pl:Lata 40. XIX wieku]]
[[pt:Década de 1840]]
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