Australia in Palestine, by Henry Somer Gullett, d.1919.
http://www.archive.org/details/australiainpales00gull

The Australian Imperial Force in Sinai and Palestine, 1914-1918, by Henry Somer Gullett, d.1923 (7 maps & 83 illustrations)
http://www.archive.org/details/australianimperi07gulluoft

Nile to Aleppo, with the Light-Horse in the Middle-East, by Capt. William Hector Dinning, d.1920 Illustrated.
http://www.archive.org/details/niletoaleppowith00dinn

From the American Libraries Internet Archive.
Joe

The Australian Official Histories are all available online at the AWM site (except vol 12 - the picture volume.

See http://www.awm.gov.au/histories/index.asp

Martin

Hello Martin, I thought so but decided to post anyway, for all those that didn't take time to check.
Cheers
Joe