With the new website some of the old forum discussions about the Mawson Trail have been lost.
Here is my blog for the Mawson http://mawsontrail.blogspot.com/
But there are many blogs and websites. Happy for people to contact me for more information about Adelaide or Kangaroo Island. I also have LOTS of information for the Flinders Rangers, Flinders by Bike, Mawson Trail, Heysen Trail, or any of the towns along the way (Riverton, Clare, Melrose, Laura, Wilmington, Quorn, Hawker, Rawnsley Park, Wilpena Pound, Blinman).
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See https://www.cyclingtouring.org/cycle-touring/join-a-cycle-tour/event/121-bike-packing/489-mawson-trail-flinders-ranges-south-australia for more information