From the librarian:

David P. Billington is the late, famed professor of Civil Engineering at Princeton University who sought to have a new kind of art, "structural art", recognized as a unique art form. His primary thesis on this can be read in "The Tower and the Bridge" however, this book, dives deeper into the particulars of the work of six of the greatest structural engineers of the 20th century, who all happen to be Swiss. This survey of the work of these six engineers describes biographical details, their research and development process, design and construction details of some of their key works, and even some of their handwritten design notes.

From Amazon:

This handsomely designed book brings together for the first time the outstanding work of four Swiss engineers and their teachers who form the most impressive group of structural artists in the twentieth century: Wilhelm Ritter (1847–1906), Robert Maillart (1872–1940), Othmar Ammann (1879–1965), Pierre Lardy (1902–1956), Heinz Isler (b. 1926), and Christian Menn (b. 1927). David P. Billington, who has written widely on these engineers, argues that it is important to consider them as artists, for aesthetics played a major role in their design philosophy. He explains that their shared approach to design was developed while they attended the Federal Technological Institute in Zurich: Maillart and Amman studied with Ritter there, and Isler and Menn studied under Lardy. Billington focuses on the engineers’ artistic approach to bridge design and construction, and he discusses their impressive individual contributions to structural engineering. Generously illustrated, this book features many newly commissioned photographs, including images of important new structures such as the Charles River Bridge in Boston, completed by Menn in 2002.