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Problems in Topological Graph Theory
Web text by Dan Archdeacon with a list of open questions in topological graph theory.
Problems in Signed, Gain, and Biased Graphs
Compiled by Thomas Zaslavsky.
Open Problems in Graph Algorithms
Compiled by Jerry Spinrad.
Problems in Graph Theory
Maintained by Peter Cameron.
Past Open Problems Columns
By Douglas B. West, from the SIAM Activity Group Newsletter in Discrete Mathematics.
Open Problems on Graph Minors
By Nathaniel Dean.
Graph Theory Open Problems
Six problems suitable for undergraduate research projects.
Gordon Royle's Open Questions
Colouring, algebraic graph theory, geometries.
Problem of the Month
Research problems collected by Bojan Mohar.
Some Open Problems in Algebraic Combinatorics
Compiled by Bill Martin.
More Open Problems Sites
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