Portal:Australia/Anniversaries/July/July 21
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- 1795 – George Gawler, second Governor of South Australia, is born in Southsea.
- 1961 – Morris Iemma, Premier of New South Wales, is born.
- 1991 – Greek tanker Kirki spills 17,280 tons of crude oil off the coast of Western Australia, the biggest oil spill in Australian waters.