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Douglas West's Books - http://www.math.uiuc.edu/~west/
Home page of D. West with description of his books: Introduction to Graph Theory, Mathematical Thinking: Problem-Solving and Proofs, Combinatorics: A Core Course, The Art of Combinatorics. |
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Digraphs: Theory, Algorithms and Applications - http://www.cs.rhul.ac.uk/books/dbook/
A comprehensive source of results, notions and open problems on directed graphs. Site offers the entire book for download as well as information on solved conjectures from the book. |
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Algebraic Graph Theory - http://cuscus.math.uwaterloo.ca/agt/
Home page for graduate level textbook "Algebraic Graph Theory" by Chris Godsil and Gordon Royle, published by Springer-Verlag, 2001. |
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Graph Theory - http://www.math.uni-hamburg.de/home/diestel/books/graph.theory/
By Reinhard Diestel. Sites offers author and book information as well as a downloadable PDF version of the book. |
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Graph Theory 1736-1936 - http://www.oup.com/us/catalog/general/subject/?view=usa&sf=toc&ci=0198539169
Two centuries of Graph Theory, by Norman L. Biggs, E. Keith Lloyd and Robin J. Wilson. |