R.I. 345 Uniqueness of weak Solutions to Systems of Conservation Laws by A.Bressan and P.G.Lefloch The whole paper is available as a compressed Postscript file by internet procedure FTP anonymous on host barbes.polytechnique.fr ( 129.104.4.100) in the directory pub/RI/1996 under the name bressan_lefloch_345.mai.ps.gz or by Netscape or any other www client via the CMAP www server "http://www.cmap.polytechnique.fr/"