Agnes Angus Brewster | |
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| Born | Sarah Agnes A. Brewster 29 April 1874 Sydney, New South Wales, Australia |
| Died | 29 December 1957 (aged 83) Royal North Shore Hospital, St Leonards, New South Wales, Australia |
| Nationality | Australian |
| Known for | headmistress and naturalist |
Sarah Agnes Angus Brewster or Agnes Angus Brewster (29 April 1874 – 29 December 1957) was an Australian headmistress and naturalist. She was the founding head of Sydney's Hornsby Girls' High School.