An exhibition "Richard Johnson (1753-1807), Nabob, Collector and Scholar" was held at the India Office Library, mounted for the Sesquicentenary of the Royal Asiatic Society. The material in connection with this exhibition is:
- Exhibition catalogue for the Exhibition held in the Conference Room, 197 Blackfriars Road, from 1 August 1973, 2 copies.
- Letter from J. Lancaster, India Office Library, to Diana Crawford, Secretary, Royal Asiatic Society, to invite members of the Society to an evening reception to view the Exhibition, dated 24 August 1973.
- Letter from Diana Crawford, Secretary, Royal Asiatic Society, to Joan Lancaster, India Office Library, to thank her for the hospitality shown on the occasion of the Society's visit to the Exhibition, dated 5 December 1973.
- Guest List for "Reception for the Royal Asiatic Society - 28 November 1973".