books.google.com - Great Building Feats shows how and why the world's greatest structures were created, and how engineering, geographical, and technical challenges were overcome during construction. Requiring the best minds of its time, each structure was, and remains, innovative and fascinating in both its creation and...http://books.google.com/books/about/The_New_York_Subways.html?id=AZ2N5N9zSbIC&utm_source=gb-gplus-shareThe New York Subways
