Noted radio historian David Gleason has been working to add a great deal of Australian material to his non-profit website (www.americanradiohistory.com)
There is now several years’ worth of Broadcasting Business and Commercial Broadcasting magazine covering 1937 to 1947 available here (Lots of great articles and stations ads in these!): http://www.americanradiohistory.com/Broadcasting-Business-AU.htm
Also - there is Radio In Australia & New Zealand from 1923-24: http://www.americanradiohistory.com/Radio-In-Australia-and-New-Zealand-AU.htm
and Wireless Weekly includes issues from 1923 to 26, along with call sign books from 1936-37:
http://www.americanradiohistory.com/Wireless_Weekly-AU.htm
