2. The book “L’Art universel des fortifications” is quite hard to find. The only library in Zürich that has a physical copy of this book, edition éd.3, rev., corr.& augm., is the ETH library, at Rämistrasse 101 8092 Zürich in the RA Rara Rar 1445 ED 3. Unfortunately it is not possible to rent the physical copy of the book, but you’re able to rent it via e rara.