Dutch Traditional Ganseys: Sweaters From 40 Villages by Stella Ruhe (published by Forte), is a wonderful book. It not only contains 60 knitting patterns but is also full of vintage photos of Dutch fisher folk wearing and knitting Ganseys – there is plenty of Gansey history to read up on and some of the stitch patterns and detailing are just lovely.
I was lucky enough to be sent a copy from here (thank you Miriam!), but you can also buy it from here.
I really like traditional Dutch costume and have quite a few of these old postcards…