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20 juli 2011

Watermerk archief

The Thomas L. Gravell Watermark Archive www.gravell.org 
The Gravell Watermark Archive brings together over 50,000 watermarks from across America and Europe. The collection incorporates some 7,500 images collected by American-watermark expert Thomas L. Gravell, and Charles-Moise Briquet’s documentation of around 45,000 unpublished marks. 

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