Serguei Petrovich Novikov & Iskander A Taymanov 
Topological Library — Part 2: Characteristic Classes And Smooth Structures On Manifolds [PDF ebook] 
Part 2: Characteristic Classes and Smooth Structures on Manifolds

This is the second of a three-volume set collecting the original and now-classic works in topology written during the 1950s-1960s. The original methods and constructions from these works are properly documented for the first time in this book. No existing book covers the beautiful ensemble of methods created in topology starting from approximately 1950, that is, from Serre’s celebrated âsingular homologies of fiber spaces.â