00291nam a2200109Ia 4500082002000000100005500020245005500075260002800130300001300158500000500171700000500176  a518.51bIn61.NH  aInternational Computer and Tabulators Ltd., London  aNineteen hundred series PERT precedence diagramsb  aLondonbThe Auth.c1967  avi, 57p.  a  a