@misc{Visscher_Nicolaes_(1618–1679)_Ducatus_[ante,
 author={Visscher, Nicolaes (1618–1679)},
 copyright={Public Domain},
 address={Amsteldam},
 howpublished={online},
 year={[ante 1677]},
 publisher={gedruckt by Nicolaes Visscher In de Kalverstraet inde Visscher},
 language={lat},
 title={Ducatus Geldria et Zutphania Comitatus},
 type={Image},
 URL={http://rcin.org.pl/Content/163351/PDF/WA51_191700_PANBKS446-19-r1677_Ducatus-Geldria-et-Z_00000001.pdf},
 keywords={chorographic maps, the Netherlands, Gelderland (the Netherlands; province), Zuthpen (the Netherlans; region)},
}