There has always been commentary that the size (over 1300 pages) of the General Rel book Gravitation by Meisner Thorne and Wheeler was done for demonstration purposes. Apparently, modern versions are only 2.5" thick which leads me to believe they must be on incredibly thin paper. I remember it being about 4-5".
The thing with MTW is that it's so big that it's quite hard to really mull over it (for me at least).
it's a book that I can imagine reading a lot in a very quiet world (i.e. basically a dorm or library before phones or computers) but it's very hard to actually get my teeth into it without that.
https://www.amazon.com/Gravitation-Charles-W-Misner/dp/06911...
Maybe tome size a Kip thing?