| http://www.w3.org/ns/prov#value | - The perfect companion to the Kovels' original best-seller, Kovels' Dictionary of Marks -- Pottery and Porcelain: 1650 to 1850 (still in print after more than 42 years and 41 printings), Kovels' New Dictionary of Marks is the most comprehensive reference for nineteenth- and twentieth-century marks.
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