00341nam a2200145Ia 450000500170000000800410001702000090005804100120006708200140007910000160009310000240010924500450013326000090017865000080018720230824143158.0180829s9999||||ii |||||||||||||| ||eng||  a7650  aEnglish  a511.5 C J  aClark, John  aHolton, Derek Allan 2aA first look at graph theorycJohn Clark  c1995  aNUL