@misc{_Der_1791,
 editor={Mellin, Ludwig August von (1754–1835). Rys.},
 editor={Jäck, Carl (1763–1808). Ryt.},
 editor={Hartknoch, Johann Friedrich (1740–1789). Wyd.},
 copyright={Public Domain},
 address={Riga},
 howpublished={online},
 year={1791},
 publisher={by Johan[n] Friedrich Hartknoch},
 language={ger},
 title={Der Rigische Kreis = Le Cercle de Riga},
 keywords={topographical maps, Riga region},
}