OTNAball (Organizaciya le Tratatosko le Nordutne Atlantikosko) si ek organizaciya le 26 themenge. Voi kerdili ando 1949to bersh te zhutisarel o Tratato le Nordutne Atlantikosko, prinjardo ando Washington, D.C., 4 April 1949.
Thema:
Danemarkaball
Estoniyaball
Finlandball
Latviyaball
Lithuaniyaball
Luksemburgoball
Norvejiyaball
Olandaball
Portugaliyaball
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