"Book of Knowledge". 7 of the books. Seems to be 1920s based on google/copyright page.
2,3,4,5,6, 9 and 19?
Poor condition.
Mildew - mostly to cover. Cigarette smoke.
Taking these apart to frame would probably be quite reasonable. They're interesting, but not valuable in this state.
I'm happy for you to sell whatever you make from this if you wish.
See my other posts for more books.
1920s kids encyclopedia, 7 books (Kitchener)
This offer has been gifted to someone and is no longer available.