Final published versions can best be located via MathSciNet (subscription required).
[ Current; 2008; 2007; 2006; 2005; 2004; 2003; 2002; 2001; 2000; 1999; pre-1999 ]
[ Current; 2008; 2007; 2006; 2005; 2004; 2003; 2002; 2001; 2000; 1999; pre-1999 ]
The recommended way to cite preprints in this series is with the report number "UCSB Math YYYY-NN".