Historical London Underground Maps
DesignTheory.org - combinatorial and statistical design theory
GAP - a free computer system for discrete algebra
GRAPE - a GAP package for computing with graphs
DESIGN - a GAP package for generating and computing with block designs
School of Mathematical Sciences, Queen Mary, University of London
Leonard Soicher's QMUL home page
lhsoicher@yahoo.co.uk , 31 October 2006.