Don't know what you've got but I've always liked our copy of Ron Edwards' 'The |Big Book of Austrailian Folk Songs aaaand the two 'Folk Songs of Australia Meri=edith, Anderson, Covell, Brown)
The Penguin Book of Australian Folk Songs has been part of our collection since it was published
Most of these are still available and if you try The Book Depository they are usually reasonably priced and post-free
Good luck
Jim Carroll