00396cam a22001097a 4500008004000000100002300040245011600063260003900179300000900218440003900227700002000266180718b2001   xxu||||| |||| 00| 0 eng d  aGuadamillas, Mario  aSecurities clearance and settlement systems: a guide to best practicescby Mario Guadamillas and Robert Keppler  aWashington, D.C.bWorld Bankc2001  a34p.  aPolicy research working paper 2581  aKeppler, Robert