i agree, i've had similar problems i'd try just typing wiradjuri into google then finding all the tidbits you can find about them, most websites only have one or two sentences but all up you should be able to find a lot of information. Another thing to remember is that the Wiradjuri tribe is also atypical to many aboriginals, they still play the digeridoo, use clap-sticks, make aboriginal tea, have welcome songs etc...