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 Percy H. Browne, Putamayo Mission Fund, 257/8, Finsbury Pavement House, E.C., enclosing details of the Mission and inviting Lieutenant Colonel Sykes to assist them.