@misc{_Xięstwo,
 howpublished={online},
 language={lat},
 language={pol},
 type={starodruk},
 title={Xięstwo Kurlandskie y Semigalskie, y powiat Piltynski},
 title={Ducatus Curlandiæ Et Semigalliæ, Districtusque Piltinensis},
 keywords={Sejm (1780)},
}