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Wikipedia, which as we often explain is only one of the Wikimedia Foundation projects we support, has an article on pretty much every major historical figure in Australian politics and culture. If you find one missing - please do let us know and we'll start writing one - or better yet encourage and support you in doing so!
As an example, you can view here a collection featuring detailed information on every single Prime Minister of Australia - with thanks to Mark Hurd for collating this into a printable 'book' which you can download and keep for free :-)