Papers of the Sykes family of Sledmere > Papers of Sir Mark Sykes (1879-1919) (Second deposit of Papers of the Sykes family) > Correspondence > File of general correspondence. Letters and telegrams to Mark Sykes > Letter from Captain and Adjutant H. W. McCall, 5th Battalion, Alexandra, Princess of Wales Own (Yorkshire Regiment), Scarborough, about a Senior Officer's Course of Instruction.