My apologies for the repeated posting but someone on the list has kindly pointed out that the correct reference to the work by Boyle, that I am trying to buy, is: Boyle, R.W. (1968) The Geochemistry of Silver and its Deposits; Geological Survey of Canada Bulletin 160, 264 pages. Please email me if you have a copy for sale. John ------------------------ John Elliot Anzeco Pty. Limited mineral exploration consulting services 26 Casey Circuit Bathurst, NSW 2795, Australia Tel +61 2 6331 4925 fax +61 2 6331 9111 Email: [log in to unmask]