@misc{_Östl._[post,
 copyright={Public Domain},
 address={[Bielitz (Bielsko-Biała)]},
 howpublished={online},
 year={[post 1911]},
 publisher={Adolf Brandstätter, Postkarten-Verlag},
 language={ger},
 title={Östl. Kriegsschauplatz. 2, Ostpreußen-Narew-Niemen-Riga},
 keywords={maps on postcards, East Prussia},
}