If you are trying to locate a library where a book or journal is held try this:
http://srlopac.slq.qld.gov.au/cgi-bin/Pwebrecon.cgi?PAGE=dbPage&SEQ=20111014103135&PID=oUihqZwbTVaQrPiJFeuGnuqKW69fo
State Library of Queensland – Find… – Catalogues – e-Resources – Please choose from this list – Library Catalogues – Libraries Australia
Not easy to use but it does enable you to search the catalogues of a wide range of Australian libraries.
Once you have found a source remember that libraries loan each other documents on Interlibrary Loan.
The State Library of Queensland for example loans document to the Brisbane City Council Library system on Interlibrary Loan (you pay 60 cents)