My Grandfather, Lorin D. Luce is in V III, I'll look again in the openlibrary.org version, but I searched twice and didn't find him. I was also surprised my dad wasn't specifically named in the book, he would be generation 11, and while I know a child's memory is fallible, I do recall we contributed to this book back in the day.
All of this made me think that maybe there's some other volumes of the book out there or a more thorough version someone might have.
*If* this book on openlibrary.org is incomplete and used regularly by genealogists, that's unfortunate. But, I will triple check this and make sure I just didn't miss something! The openlibrary.org version was confusing to me because the table of contents seemed to indicate it was the complete V1-V4 + addendum, there was also a whole series of "revisions" posted. I'm just not sure which "version" to use or is widely accepted as "the" final document?