1. Department of Chemistry, Materials and Forensic Science, University of Technology, Sydney, PO Box 123, Broadway NSW 2007, AU.
2. Forensic Services, Australian Federal Police, GPO Box 401, Canberra ACT 2601, AU.
3. CSIRO Petroleum, PO Box 136, North Ryde, NSW 2113, AU.
4. Isotope and Geochemistry Lab Australian Geological Survey Organisation PO Box 378, Canberra, ACT, 2601, AU.