www.geometer.org/mathcircles/graphprobs.pdf
http://www.mpi-inf.mpg.de/~pascal/graphtheory_exercises.html --very good set of questions , with solutions
www.math.udel.edu/~lazebnik/papers/688hwsols.pdf --graph theory and combinatorics part 1
http://www.math.udel.edu/~lazebnik/papers/689H1-4S.pdf --graph theory and combinatorics part 2
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