@misc{Helwig_Martin_(1516-1574)_Silesiae,
 author={Helwig, Martin (1516-1574)},
 howpublished={online},
 publisher={Jo[hann] Buss[emacher]},
 language={łaciński},
 type={map},
 title={Silesiae Ducatus Accuratissime Descriptus a Mart: Heilwig Neissense},
 keywords={1501-1600, Geografia i nauki o ziemi, Kartografia, Śląsk},
}