Papers of the Sykes family of Sledmere > Papers of Sir Mark Sykes (1879-1919) (Second deposit of Papers of the Sykes family) > Correspondence > File. General correspondence, letters and telegrams to Mark Sykes > Letter. A. Broom, York Passenger Signalman’s Society, 9 Butcher Terrace, Bishopthorpe Road, York to Mark Sykes