With this work the authors are filling a gap which is existing on the research material of watermarks of the seventeenth century. The research for this book is based on the X-ray method developed by Jan van Aken, emiritus professor dental radiology of the University of Utrecht. This method guarentees a 100% accurate digital image of the watermark. With 675 true size photographs and detailed descriptions

Contributions by: Dirk Imhof, Claude Sorgeloos