The file contains an envelope addressed to 'John Rees, Adviser in Agricultural Botany'; correspondence, 1923-1925, between John Rees and D. Lleufer Thomas relating to the Welsh Housing & Development Association Yearbook, 1924; a letter from the National Museum of Wales to the National Library of Wales, 1955, enclosing the material as a donation from John Rees's widow, and a copy of the acknowledgement letter from the Library to Mrs Rees, 1955.