It joined in 1961 even before some Western and NATO nations such as Portugal , Ireland , Greece and Turkey , which joined in 1964 , 1965 , 1974 and 1975 respectively .
Head entity: 1965 Q203975 26
Tail entity: 1964 Q203983 24
Relation (head \u2192 tail): P155
Inverse relation (tail \u2192 head): P156