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British Journal of Sociology on trench warfare []

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Citation for world war 1 almanac (hanging indentation)

Pendergast, Tom and Sara Pendergast. //World War 1 Almanac//. Edited by Christine Slovey. Detroit: Gale Group, 2002.

http://www.spartacus.schoolnet.co.uk/FWWtrench.htm

farm tractor as father of modern tank - page 130 http://www.jstor.org/stable/3742599?seq=4

Memoirs of Daniel Holmes of the Royal Engineers http://wwi.lib.byu.edu/index.php/Memoirs_of_Daniel_Holmes_of_the_Royal_Engineers

Account of Oswald Blows from the Battle of the Somme http://www.iwm.org.uk/server/show/nav.2195

http://www.firstworldwar.com/features/trenchlife.htm

http://www.ww1westernfront.gov.au/battlefields/hindenburg-line-montbrehain-1918.html

http://www.au.af.mil/au/awc/awcgate/ww1/aef-wwi.htm