@misc{_Kreis,
 howpublished={online},
 publisher={Verlag von C. Flemming in Glogau},
 language={ger},
 title={Kreis Insterburg (A. 267.V.09)},
 type={mapa},
 keywords={Czerniachowsk, Obwód Kaliningradzki, Wystruć, Čern'ahovsk},
}