Catalogue of the exhibition "Shades of Blue: the Dutch Delftware from the Collection of Professor Wojciech Kowalski and the National Museum in Wroclaw" held at the National Museum in Wroclaw from 25 February to 30 June 2013 and the exhibition "Delftware: the Collection of Professor Wojciech Kowalski" held at the Gliwice Museum from October to November 2013