This an interesting old book about Fiat motors and stuff for the first flying machines I'd finished these days @ National Library of Serbia. Didn't took me to much time to heal. Covers are soft as is the binding, just a lot previous glue was in an acid paper. Some tired places on the cover was fixed by toned paper, and manual one side lamination with tick Japanese paper (kozo shi 60+g/m2).
Here is result before and after, and it waiting a proper bookbinder soon, will post photos ;-)