Some or all works by this author are in the public domain in Australia and possibly other jurisdictions. This is because it is a work of an Australian government (Commonwealth, State or Territory) and was published more than 50 years ago. The copyright has therefore expired.
The government of Australia has declared that the expiration of Crown Copyrights applies worldwide. This has been confirmed by correspondence received in OTRS ticket#2017062010010417.
See also Australian Copyright Council – Duration of Copyright or National Archives of Australia – Copyright – Fact sheet 8