I also have what you call the "fatboy" (this is the first I've heard that term but I guess it fits), the 1953-1960 published in 1963. This naïve young (age 23) man (that's me) has underlining in the preface that I now have no idea why I did it.
With all those cross references, footnotes, etc. -- we all thought it was the ultimate in the technology of the day.
I'm not sure what computer technology WT had in those days. The midwestern company that I worked for in 1963 would introduced us to labor reporting the following year, data that was fed via punch cards into an IBM 360.