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Details for:
IELTS (n.d.) History of IELTS Retrieved 2015-09-15, from
http://www.ielts.org/researchers/history_of_ielts.aspx
events
Events:
4 events from this source recorded
1980
ELTS first set
1987
Edinburgh validation study of ELTS
1989
IELTS first set
1995
2nd version of IELTS first set