Changes

*[https://archive.org/details/firstdayonsomm00midd ''The First Day on the Somme, 1 July 1916''] by Martin Middlebrook 1972. [https://archive.org/details/firstdayonsomme10000midd/page/n3/mode/2up 2nd file, 1984 reprint]. Archive.org Lending Library. Includes interviews with many survivors, both British and German.

:[https://archive.org/details/sommebattlefield0000midd/page/n1/mode/2up ''The Somme Battlefields : a Comprehensive Guide from Crécy to the Two World Wars''] by Martin and Mary Middlebrook 1991. Archive.org Books to Borrow/Lending Library.

*[https://archive.org/details/sommedaybydayacc0000mcca/mode/2up ''The Somme : the day-by-day account''] by Chris McCarthy 1993. Archive.org Books to Borrow/Lending Library

*[https://archive.org/details/lifeatlimittrium0000watk/mode/2up ''The Imperial War Museum Book of the Somme''] by Malcolm Brown 1996. Archive.org Books to Borrow/Lending Library

*[https://archive.org/details/attritiongreatwa0000neil ''Attrition : the Great War on the Western Front, 1916''] by Robin Neillands 2001. Archive.org Books to Borrow/Lending Library.

*[https://archive.org/details/somme0000shef ''The Somme''] by Gary Sheffield 2003. Archive.org Books to Borrow/Lending Library