@misc{Blaeu_Willem_Janszoon_(1571–1638)._Ryt._Polonia_[1635],
 author={Blaeu, Willem Janszoon (1571–1638). Ryt. and Blaeu, Joan (1596–1673). Wyd.},
 copyright={Public Domain},
 address={[Amsterdam]},
 howpublished={online},
 year={[1635]},
 publisher={Guiljemus et Iohannes Blaeu},
 language={lat},
 title={Polonia Regnum, et Silesia Ducatus},
 keywords={chorographic maps, Poland, Duchy of Silesia, 17th century},
}