The program is illustrated with a selection of historical photographs from the South Australian Glass Negative Collection, a quasi-official (my interpretation of a lengthy description on p viii of the program)
I hope that more, if not all, of the 14,000 images in the collection will be published online.
Update PS (later 20 May)
As part of History Week ABC RN's Hindsight has today broadcast a documentary on G W Goyder, the 19th century SA Surveyor General who delineated the line beyond which grain growing in the Province (as it was then known) was not sustainable. The program website has some interesting supplementary material and details of how, at least for the next few weeks, to listen or download the program. I hope that the producers also make a transcript available.