https://www.armyupress.army.mil/Portals/7/combat-studies-institute/csi-books/toppe.pdf
http://deutsches-afrikakorps.blogspot.com/2010/12/demands-of-life-in-desert.html
http://ww2today.com/new/2016-2/rommels-army-desert
https://armyhistory.org/the-other-foe-the-u-s-armys-fight-against-malaria-in-the-pacific-theater-1942-45/
http://www.dererstezug.com/Tinned_Meat_in_the_German_Army_Iron_Ration.htm
http://www.dererstezug.com/PackagingForZwieback.htm
http://www.dererstezug.com/thefullironration.htm