I took one out they are blank on the back, and unfotunately were glued in so there is a thin square of cardboard, on the back, paper thickness is like a business card. Not sure if that's just a sample page out of the book but mine are similar but nin style but not identical
Heres a higher res image of the queen and the back damage.
https://photos.app.goo.gl/Ff056hOf1K2tOMmK2