They include two unpublished lectures which have languished in an attic for 35 years.
Sir Geoffrey Jellicoe (8 October 1900 – 17 July 1996) was a founding member of the Landscape Institute and the founding president of the International Federation of Landscape Architects (IFLA). He wrote many books, including The Landscape of Man (1975).
His design work included Hemel Hempstead New Town, gardens for the Royal Family at Windsor and Sandringham, the Kennedy Memorial at Sandringham and Sutton Place in Surrey. He taught at Thames Poly/University of Greenwich.
The lost lectures, found by garden historian Tom Turner in his attic, are:
• On draughtsmanship: Sir Geoffrey learned to draw at the AA in the 1920s. After writing Italian Gardens of the Renaissance he gave up drawing for 50 years. Then he went back to drawing in the 1970s when writing his history of landscape and garden design The Landscape of Man.
Telling his friends that "life begins at 80", Sir Geoffrey then undertook the largest garden design projects of his career, emphasising the qualities of "feeling" and "luminosity" in his drawings.
• On the relationship of landscape architecture to architecture: Sir Geoffrey said these arts were "interlocked". Landscape architecture was "the most comprehensive of the arts" while architecture was "the noblest of the arts".
The two lost lectures were given to students at Thames Poly (now the University of Greenwich) in 1982. Sir Geoffrey predicted "an immense call on landscape architects" and told his students they were studying at "the best architectural-landscape school in the world".
Tom Turner, who recorded and edited the lectures, said: "Jellicoe is a key figure in 20th-century landscape architecture and finding the recordings in my attic was a delight. Jellicoe's views on drawing and the art of landscape architecture are inspiring, heartfelt and candid. Hearing Jellicoe talk gives you another appreciation of his books - though I wish the audio quality was better."
The LAA, launched in 2015, aims to support, record and debate the contribution landscape architects make to the conservation and improvement of public landscapes.