A History of Engineering and Science in the Bell System
Switching Technology (1925-1975)

0. Front Matter
1. Chapter 1: Setting and Scope
2. Chapter 2: State of the Art in 1925
3. Chapter 3: The Evolution of Electromechanical and Manual Switching Technology 1925-1935
4. Chapter 4: Introduction of Crossbar
5. Chapter 5: A Better Understanding of Switching
6. Chapter 6: Preparing for Full Automation
7. Chapter 7: No. 5 Crossbar
8. Chapter 8: Direct Distance Dialing
9. Chapter 9: Beginnings of Electronic Switching
10. Chapter 10: Completing the Electronic Switching Family
11. Chapter 11: The Service and Feature Era
12. Chapter 12: The Integrated Digital and Toll Network
13. Chapter 13: Private Branch Exchanges, Key Telephone Systems, and Special Systems
99. Rear Matter

All chapters: 100 MB tar.gz file