These page numbers are in reference to an older PDF file that we “inherited” from an unknown source. I’ve been working on our own, more complete one for awhile now, and have an interim version linked in our Wiki. You’ll have to look up the passages in that file, but the benefit of it is that at the bottom of each page you can see which book a passage is from:
https://archive.org/details/cc-all-books-in-one-20-texts-interim-version
There are more files available here, and a link to a page that includes the older files as well: