Pierre le Muet – Manière de bastir pour touttes sortes de personnes (1623, Paris)
This page contains a very detailed study of a typology of wooden roof. What I really like about this page are the accuracy and clarity of the illustration, which show exactly all the different parts of the roof.
I choose this page mainly because of the beautiful drawing on it.
The book has a brown leather cover with no ornaments and no information on the author nor the name of the book on the outside and it is around two centimetres thick.