05-00 General reference works (handbooks, dictionaries, bibliographies, etc.) pertaining to combinatorics 27

05-03 History of combinatorics [Consider also classification numbers pertaining to Section 01-XX] 421

05B10 Combinatorial aspects of difference sets (number-theoretic, group-theoretic, etc.) [See also 11B13] 1701

05Cxx Graph theory {For applications of graphs, see 68R10, 81Q30, 81T15, 82B20, 82C20, 90C35, 92E10, 94C15} 123587

05C60 Isomorphism problems in graph theory (reconstruction conjecture, etc.) and homomorphisms (subgraph embedding, etc.) 2987

05C62 Graph representations (geometric and intersection representations, etc.) {For graph drawing, see also 68R10} 2442

05C70 Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.) 12364

05C90 Applications of graph theory [See also 68R10, 81Q30, 81T15, 82B20, 82C20, 90C35, 92E10, 94C15] 7092

05D40 Probabilistic methods in extremal combinatorics, including polynomial methods (combinatorial Nullstellensatz, etc.) 442