@misc{_Silesia,
 howpublished={online},
 publisher={[s.l.]: [Matthäus Merian]},
 title={Silesia Ducatus: A Martino Helwigio Nisseni descriptus},
 type={mapa},
 keywords={miedzioryt, kartografia, mapa, Śląsk, Merian, Mathäus (1593-1650)},
}