If a special spell is a major goal in your story  - or just a few pages of text, then having your gamers find it in a massive volume assembled by an “Otherworldly Secret Order Shrouded in Mystery” etc. might be just the ticket. ( especially if the lighting is right ). It’s not by any means a "quick and dirty" prop, but the dramatic impact of exagerated scale could just make the role play more fun, and definitely more memorable!

Some methods used to make these books can be applied to other projects as well. I would be curious to see other attempts at massive books, particularly if the inner blocks were replaced with “Foamcore” pages. That would keep

them light enough to move easily and make them more functional!