Material connected with the Joint Session of the Royal Asiatic Society, Société Asiatique, the American Oriental Society and the Scuola Orientale - R. Universita di Roma was held in London from 3-6 September 1919. These are:

• Memo from Charles R. Lanman, American Oriental Society concerning the date set for the Joint Session. Dated 16 July 1919.
• Programme for the Joint Session of the Royal Asiatic Society, Société Asiatique, the American Oriental Society and the Scuola Orientale - R. Universita di Roma detailing the events and list of participating Members.
• Programme of meetings for the Joint Session by Eleanor Hull, Secretary, Royal Asiatic Society.
• Letter from Eleanor Hull to inform members of the Royal Asiatic Society of the Joint Session and to invite offers of hospitality.
• Form for application for tickets for the Dinner at the Imperial Restaurant, Regent Street, on 6 September 1919.
• Admittance ticket for events at the British Museum, the School of Oriental Studies and Kew Gardens.

The International Union of Orientalists was founded in September 1951 in Istanbul at the International Congress of Orientalists. It was renamed in 1973 as the International Union for Oriental and Asian Studies. This material covers the interaction of the Royal Asiatic Society with the Union in the time period 1951-1977.

The International Congress of Orientalists, initiated in Paris in 1873, was an international conference of Orientalists. It was later renamed as the International Congress of Human Sciences in Asia and North Africa and then as the International Congress of Asian and North African Studies. This material covers the interaction of the Royal Asiatic Society with the Congress in the time period 1889 to 1993.

Correspondence regarding the attendance of the drinking horn presented by the King of Sweden in 1899 at the Stockholm Congress. These are:

• Letter from the Secretary, Royal Asiatic Society, to The Keeper, Department of Conservation, Victoria & Albert Museum, to ask his advice regarding repairs to the drinking horn. Typed, dated 13 March 1967.
• Letter from N.S. Brommelle, Keeper, Department of Conservation, Victoria & Albert Museum, to Secretary, Royal Asiatic Society, to ask to see the drinking horn in order to advise regarding repairs. Typed with handwritten annotations, dated 17 March 1967.
• Letter from the Secretary, Royal Asiatic Society, to Mr Beecher, Department of Conservation, Victoria & Albert Museum, to ask for the repairs to be undertaken. Typed, dated 18 May 1967.
• Letter from the Secretary, Royal Asiatic Society, to Mr Beecher, Department of Conservation, Victoria & Albert Museum, to send the receipt for the repairs undertaken. Typed, dated 6 June 1967.
• Letter from Secretary, Royal Asiatic Society, to Phoenix Assurance Co. Ltd. to ask for cover for the drinking horn during its time in Ann Arbor in the custody of Mr. H.L. Shorto. Typed, dated 18 July 1967.
• Letter from Phoenix Assurance Co. Ltd. to Secretary, Royal Asiatic Society, to enclose the Policy for cover of the drinking horn. Typed, dated 27 July 1967. The policy is with this letter.

Correspondence with Sir Jadunath Sarkar, Darjeeling. These are:

Letter from Co. Hoysted, Secretary, Royal Asiatic Society, to Sir Jadunath Sarkar to ask, on behalf of the Council, whether he would represent the Society at the Tenth All-India Oriental Conference. Dated 16 March 1939.

Letter from Sir Jadunath Sarkar to Col. Hoysted to state that he will be unable to be a delegate as he has chosen to no longer attend conferences. He also writes concerning a review that he will send to the Society. Dated 14 April 1935.

Correspondence between the Association of British Orientalists and the Royal Asiatic Society concerning the standing of members of the Royal Asiatic Society within the Association of British Orientalists. These are:

• Notice from Richard Hill, Association of British Orientalists, to announce the twelfth Conference of the British Orientalists to be held under the joint auspices of the Association and the Royal Asiatic Society at the University of Durham, 3-6 September 1962. Dated 1 March 1962.
• Draft letter from the Royal Asiatic Society concerning the illogical position that members of the Royal Asiatic Society will be expected to pay a membership fee for the Association of British Orientalists in order to attend the Conference though the Royal Asiatic Society is sponsoring the event, dated 8 October 1962.
• Letter from Richard Hill, Association of British Orientalists, to Richard Winstedt, Royal Asiatic Society, to state that he no longer holds office in the Association and so has passed Winstedt's letter to the Secretary, Mr T.F. Mitchell. Dated 10 October 1962.
• Letter from T.F. Mitchell to Richard Winstedt to clarify the position concerning the Royal Asiatic Society members attendance at the Conference, dated 1 November 1962.

Correspondence with Reverend Henry Heras, Director of the Indian Historical research Institute, St. Xavier's College, Bombay. These are:

Letter from Col. Hoysted, Secretary, Royal Asiatic Society, to Henry Heras to ask, on behalf of the President and Council, whether Heras would be willing to be the Society's delegate at the Seventh Indian Oriental Conference alongside Dr. D.R. Bhandarkar as a second representative. Dated 18 April 1933.

Letter from Henry Heras to Colonel Hoysted to inform that he would be delighted to represent the Society alongside his friend, Dr Bhandarkar. Undated.

Letter from Col. Hoysted, Secretary, Royal Asiatic Society, to Henry Heras to inform that the President and Council are most gratified with his response and to enclose the official notification. Dated 10 July 1933.

Letter from Col. Hoysted, Secretary, Royal Asiatic Society, to Henry Heras (and Dr. Bhandarkar) to state that he has just received the second bulletin concerning the conference which includes the programme. Hoysted asks that it they have not received this bulletin for them to ask for one from Baroda. Dated 30 October 1933.

Letter from Henry Heras to Colonel Hoysted to inform him that he has received the bulletin, that he will be leaving for the conference on 26th December and of the title of the Paper that he will read. Dated 14 December 1933.

Letter from Col. Hoysted, Secretary, Royal Asiatic Society, to Henry Heras to thank him for the report he sent about the Conference and to convey the President and Council's thanks. Dated 21 February 1934.