I'm hoping someone can answer my question (and that it's posted in the correct place).
Welcome to BGG. For future reference, each game has its own page with info and forums, which you can find via SEARCH Board Game at the top of the page. E.g. that will lead you to:
Memoir '44: Campaign Book Volume 1
which has a lot of info about the campaign book.
Often there you can find the answer to such questions without even needing to post. If you do still need to post, then post it in the relevant game's forum with a clear specific thread subject, e.g. "How many pages in the Memoir 44 Campaign books?"