@misc{Dietrich_Bruno_(1886–1946)_Karte_[ca,
 author={Dietrich, Bruno (1886–1946)},
 editor={M. & H. Marcus (Wrocław)},
 copyright={Public Domain},
 address={Breslau},
 howpublished={online},
 year={[ca 1921]},
 publisher={M. & H. Marcus},
 language={ger},
 language={eng},
 language={fre},
 title={Karte des Oberschlesichen Industriedreiecks : Industriekarte = Map of the industrial triangle in Upper Silesia = Carte du triangle industriel de la Haute-Silésie},
 keywords={economic maps, Upper Silesia, Upper Silesian Industrial Region},
}