This photograph of Herero prisoners of war in German Southwest Africa from the early 20th century was distributed as a postcard.
Deutsch-Südwest-Afrika, Kriegsgefangene Nama, coloured postcard, 1904, unknown photographer; source: Deutsches Bundesarchiv (German Federal Archive), image 146-2003-0005, Wikimedia Commons, http://de.wikipedia.org/w/index.php?title=Datei:Bundesarchiv_Bild_146-2003-0005,_Deutsch-S%C3%BCdwest-Afrika,_Kriegsgefangene_Herero.jpg&filetimestamp=20081209160937, Creative Commons Attribution-ShareAlike 3.0 Germany (CC BY-SA 3.0 DE), http://creativecommons.org/licenses/by-sa/3.0/de/deed.en.