As said to be rediscovered by Hedi Kyle, the secret Belgian binding is a unique non-adhesive binding method that includes sewing 3 pieces of bookboard together to form the case, and sections sewn onto the thread case.
This post via
http://cailun.info/index.php?/archives/364-Duotone-volume-Part-I.html
http://cailun.info/index.php?/archives/372-Duotone-Part-II.html
HOW TO do your own Secret Belgian Binding at
http://cailun.info/index.php?/archives/319-Secret-Belgian-Binding.html
