International Association of Paper Historians

A Digital Catalogue of Watermarks and Type Ornaments Used by William Stansby in the Printing of The Workes of Benjamin Jonson (London: 1616)

Le filigrane degli archivi genovesi

Watermarks in Incunabula Printed in the Low Countries (from the collections of the Koninklijke Bibliotheek — National Library of the Netherlands)

Wasserzeichen des Mittelalters (Watermarks of the Middle Ages, Vienna, Austria)