1. Between the last part of the 1800's and the first part of the 1900s. H. C. Russell. Government Astronomer and Meteorologist in New South Wales. contributed to accumulated data on tornadoes in that area
2. Clarke, R. 1962.Severe Local Wind Storms in AustraliaEdited by: H. 56 Division of Meteorological Physics Technical Paper No. 13
3. The editor explains however that direct comparison with US. Territories is not very meaningful in terms of density because of the high population concentration in Sydney