 Complete the following phrase:  However, the bushfires on Black Friday 1939 were one of the worst natural disasters to have occurred in Australia and certainly the worst bushfire up to that time. The 1939 Black Friday fires in Victoria burnt 2 million hectares, 69 mills were destroyed, 71 people died, and several towns were entirely obliterated. Only the Ash Wednesday bushfires in Victoria and South Australia in the summer of 1983 and the 