Looking for advice about protecting an old book.

I have a book of about 60 linen pages. The pages are about 15 inches tall and 10 inches wide.

Is the register book from a hotel and has signatures from the early 1900s to about 1970.

I want to protect the pages without taking it apart. Are there some sort of plastic sheets I can put between each page? Maybe something like a sleeve? I've done some reasearch, and all I can find is top loaders.

Any suggestions would be appreciated.

Thanks.