Graph Theory (Dover Books on Mathematics)

Introduction to Knot Theory (Dover Books on Mathematics)

An Introduction to the Theory of Groups (Dover Books on Mathematics)

A Course on Group Theory (Dover Books on Mathematics)

An Introduction to the Theory of Groups (Dover Books on Mathematics)

Pearls in Graph Theory: A Comprehensive Introduction (Dover Books on Mathematics

Information Theory (Dover Books on Mathematics)

Extremal Graph Theory (Dover Books on Mathematics)