  This is the first installment of a book on combinatorial and geometric group
theory from the topological point of view. This is a classical subject. The
installment contains Chapters 1, 3 and 4, and there are nine chapters in total:
1. Combinatorial Complexes 2. Topological Invariants 3. Coverings 4. Galois
Theory 5. Generators and Relations 6. The Topological Dictionary 7. Amalgams 8.
The Arboreal Dictionary 9. Ends.
