If I were a Springer-Verlag Graduate Text in Mathematics, I would be Lawrence C. Washington's Introduction to Cyclotomic Fields.

I am a carefully written exposition of a central area of number theory that can be used as a second course in algebraic number theory. Starting at an elementary level, I cover p-adic L-functions, class numbers, cyclotomic units, Fermat's Last Theorem, and Iwasawa's theory of Zp-extensions, leading the reader to an understanding of modern research literature. Many exercises are included.

Which Springer GTM would you be? href="http://www.math.mcgill.ca/~dsavitt/GTM.html">The Springer GTM Test