Collected Papers Of Marston Morse (In 6 Volumes)

"When one compares the development of Morse theory to that of a number of other subjects that have been around for the same length of time, it may come as a surprise to realize the degree to which what you see here in these six volumes is pretty much what there is. And what that is, is a beautiful and fundamental theory, clearly one of the gems of twentieth-century mathematics.'' R Osserman Mathematical Reviews, 1989