[Fred Nerks]

http://www.cl.cam.ac.uk/~mgk25/iso-paper.html

does this site show Australia went to A4 in 1974?

(three days of this and I’m going blind!)

[rxsid]

'does this site show Australia went to A4 in 1974?'

"Porstmann’s DIN paper-format concept was convincing, and soon introduced as a national standard in many other countries, for example...Australia (1974)"

That's how it reads to me. Nice work!

[Bikkuri]

does this site show Australia went to A4 in 1974? (three days of this and I’m going blind!)

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lol, I must be too.. because all I get is a blank yellow screen :p
Might because I have cookies blocked :/

I usually don't use wiki... but this shows most, if not all, countries and the year they started using a4].
BTW, it agrees with you; ) 1974!
(o.o)