I am looking for figures of the emu population in Australia over history.
Ideally from 1900 or even further, and especially around the time of the Emu War.
Even a simple histogram would be enough.
Freely reusable data is needed.
If you want general populations of emu in Australia, try Birdata, which shows populations of Australian birds by location and time, and allows you to download custom datasets. Here's the link for emus. Many other sites simply state that the emu is not endangered.
For a truly interesting read on the Great Emu War, check out this Scientific American article.