Since this workshop is dedicated to my "50 years of professional activity", it may not be out of place to give a brief account of what came out of all this activity! Listing the publications is a partial answer, which I am trying to supplement here with some indications of contents. It is impossible, within a reasonable amount of space, to go into any great detail, but just enough information will be given so that anyone who reads this can decide whether to look up an original source for more details. The material is organized into nine sections, each devoted to a particular subject area, and a tenth one with a brief summary of impact. Publications that seem more significant than others are listed immediately following the subsection headings.