This second volume in a two-volume series provides an extensive collection of conjectures and open problems in graph theory.
Graph Theory
Reinhard Diestel
Graph Theory with Applications to Engineering and Computer Science, Paperback/Narsingh Deo
Narsingh Deo
Advanced Graph Theory and Combinatorics
Michel Rigo
Applying Graph Theory in Ecological Research
Mark R. T. Dale
Extremal Graph Theory, Paperback/Bela Bollobas
Bela Bollobas