00289nam a2200121Ia 45000030006000000080041000060400015000471000022000622450034000842600020001185460012001380050017001500STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGibson George, A.  aElementary treatise on graphs  bMacmillanc1920  aEnglish20220125170029.0