EMIGRANTS CROSSING PLAINS. - Emigrants crossing the American Plains. Line engraving, 19th century.. Fine Art. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016. quest.eb.com/search/140_1637071/1/140_1637071/cite. Accessed 27 Nov 2017.
Unemployed men queuing outside a soup kitchen in New York, c1930, during the Great Depression. . Photography. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016. quest.eb.com/search/300_2285372/1/300_2285372/cite. Accessed 27 Nov 2017.
World War One - a Royal Flying Corps aircraft drops torpedo towards its target. circa 1915. Photography. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016. quest.eb.com/search/300_3495082/1/300_3495082/cite. Accessed 27 Nov 2017.
World war 2, children behind barbed wire in a german concetration camp set up in the occupied part of the karelian assr, 1941 or 1942.. Photograph. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016. quest.eb.com/search/300_271373/1/300_271373/cite. Accessed 27 Nov 2017.