Graphs of Groups on Surfaces

This title, suitable as both an introductory reference and as a text book in the rapidly growing field of topological graph theory, models both maps (as in map-... » 

This title, suitable as both an introductory reference and as a text book in the rapidly growing field of topological graph theory, models both maps (as in map-colouring problems) and groups by means of graph imbeddings on sufaces. Automorphism groups of both graphs and maps are studied. «