00385nam a2200145 a 450000500170000002000150001708200150003210000190004724500350006626000290010130000230013049000390015370000200019270000270021220251203110217.0  a0387987363  a511.6bHAR  aHarris, John M  aCombinatorics and graph theory  aNew YorkbSpringerc2000  ax,225p.c22cm. HB.  aUndergraduate texts in mathematics  aHirst, Jeffry L  aMossinghoff, Michael J