I have been reading through the wikipedia article about Chern classes and it currently has a section devoted to the Alexander Grothendieck axiomatic approach. The language used throughout the section ("He shows using the Leray-Hirsch theorem (...)") seems to imply that there is a paper or a book written by Grothendieck himself containing the results mentioned.
Thus, my question is: does such a paper exist? Did Grothendieck ever write about the topological Chern classes?
I started my search by reading through a paper referenced in the wikipedia article, La théorie des classes de Chern and it very well may be what I am looking for. I can't tell, because, being written in french, it is basically unreadable to me. Still, I have a feeling that this is not the right paper, because it doesn't reference the aforementioned Leray-Hirsch theorem and the notation used throughout highly suggests that this is the algebro-geometrical case.