Citation form Mosser, Daniel W. , Ernest W. Sullivan II, with Len Hatfield and David H. Radcliffe. The Thomas L. Gravell Watermark Archive. 1996-.
2013-12-21 <www.gravell.org> Cite individual records using the Name-Number designation.
The University of Delaware Library's Thomas L. Gravell Watermark Collection is owned by the University of Delaware. All rights reserved.
The unpublished Watermarks and Records from the Briquet Archive (Ms Briquet xxx) are owned by the Bibliothèque de Genève. All rights reserved.