Thanks!
I think contact glue will not work, because I need time to form folds. That is, it is necessary that the glue does not dry out instantly.
In addition, I need to paste together the end and the cover. Endpaper will stick on the cardboard and on the leather that is at the edge.
If PVA copes with this it will be fine. But is not yellow paper from PVA? And, is PVA durable?