Collection 18/2 Correspondence: Inter - Imperial relations and channel of communications - Correspondence between Departments of His Majesty’s Government and foreign diplomatic representatives in the United Kingdom: memoranda 1918 - 1920
Collection 18/3 Correspondence: Inter - Imperial relations and channel of communications - Channel of communication between the Air Ministry and authorities in India on civil aviation questions
Collection 18/4 Correspondence: Inter - Imperial relations and channel of communications - India and the League of Nations: question of direct correspondence on certain subjects
Collection 18/5 Correspondence: Inter - Imperial relations and channel of communications - India and the International Commission for Aerial Navigation: question of direct correspondence
Collection 18/6 Correspondence: Inter - Imperial relations and channel of communications - System of communication and consultation with the Dominions and India on matters relating to foreign affairs