00309nam a2200109Ia 4500008004100000082001900041100001700060245002900077260002900106300003100135490003300166250701b        |||||||| |||| 00| 0 eng d  a511.5bOr66.GT  aOre, Oystein  aGraphs and their usesb/  aNew York:bRandom,c1963  aviii, 131p. Bibl. Glossary  aNew Mathematical Libraryv10