My friend Julia Solis published an excellent book aptly titled
New York Underground: The Anatomy of a City in 2005. (For German readers, she had previously published a german-language version of the book under the title
New York Underground: Anatomie einer Stadt (CH. Links Verlag; Berlin 2002).)
Some of my photos are featured in the book, including photos of sewer construction and the "cyclotron" at Columbia University.
Solis, Julia. New York Underground: The Anatomy of a City. Routledge; New York and Great Britain, 2005
Available at Amazon.com