Bridges
Free to read here, from Project Gutenberg.
Alexander's Bridge
The bridge of San Luis Rey
A book of bridges
The Bridge-Builders
Fences, Gates and Bridges: A Practical Manual
The Anatomy of Bridgework
Instructions on Modern American Bridge Building
Web of steel
Scamping Tricks and Odd Knowledge Occasionally Practised upon Public Works
Bridge Disasters in America: The Cause and the Remedy