The Royal Asiatic Society from 23-27 July 1973 entitled "The Undeciphered Languages". The material in this series covers the administration, correspondence and advertising of this Symposium.

As part of the Sesquicentenary Celebrations the Royal Asiatic Society decided to host a series of National Days at approximately monthly intervals to highlight the countries in which the Society was particularly interested and with the hope of strengthening ties between various bodies interested in Asia. This material covers the organisation of these events.

As part of the Sesquicentenary several Fellows went to give lectures at schools. This series contains administrative material and correspondence concerned with these lectures.

Correspondence and administration concerned with contacting the Branch and Allied Societies of the Royal Asiatic Society regarding the Society's Sesquicentenary celebrations.

In celebration of the Royal Asiatic Society's sesquicentenary various exhibitions of its collections were arranged. This series contains material concerned with organising and documenting those exhibitions.

In commemoration of the Sesquicentenary, the Royal Asiatic Society considered a number of publications. This material contains some draft material for publications an correspondence concerning publications.

Appeal brochures for the Royal Asiatic Society sesquicentenary and correspondence concerning them.

Standard Appeal Statements and Letters concerning fundraising for the Royal Asiatic Society Sesquicentenary.

Correspondence regarding the use of professional fundraisers to help with the Sesquicentenary Appeal.

Correspondence and Lists concerning Companies to Approach for Contributions to the Sesquicentenary Appeal. These are:

• Letter from G.A. Calver to Dr John Hansman to send him The Times list of the 1000 largest companies. He suggests a circular is produced to solicit interest from them. He also writes of the companies and organisations that he will personally approach and that he will send Mr Alexander to help on the day of the Reception, dated 16 January 1973.
• The Middle East Association List.
• Asian Banks in London - Indian, Japanese, Pakistani, Middle East, Malayan and Singapore.
• Japanese Trading Houses and Companies in London.
• List of Pakistani Firms in the U.K. with compliment slip from The Embassy of Pakistan.
• List of Companies, who has approached them and their donations.
• Commerce and Industry Company donations.