Australian Banknotes 50 Australian dollars banknote of 1991.

Australian banknotes currency Fifty Dollars bill
50 Australian dollars banknote
Australian dollars notes money images pictures
  Australian paper fifty dollar note, circulated between 1973 and 1995.
50 Australian dollars banknote of 1991, issued by the Reserve Bank of Australia.
Australian banknotes, Australian paper money, Australian bank notes, Australia banknotes, Australia paper money, Australia bank notes

The original fifty dollar note, designed by Gordon Andrews, has a scientific theme.
Obverse: Portrait of Australian pathologist Sir Howard Florey and scenes of laboratory research.
Reverse: Portrait of Sir Ian Clunies Ross, veterinary scientist and first chairman of the CSIRO, along with scenes from the Australian environment.