I just love people who talk about something where they are totally clueless. You don't copyright portions of an item.
it's all or nothing.
The entire book had the copyright reclaimed by the Society in 1981. Anyone can re-copyright something where the original copyright has expired. In the case of this book, they made sure proper reference was given to the original author and publication.
Now, that being said, if the Society gives anyone permission to scan and print the book, then the Copyright becomes a moot point for that reproduction. But if they haven't, they should protest against both Curry and Heritage Quest and anyone else who attempts to reprint the book in any format.
Unfortunately, that protest would become a legal fight and the Society would probably not have the money to pursue it properly.