These letters written by Daphne to her parents are presumed to be from the estate of her mother, Lila Mayo. Daphne wrote letters to both her parents and to each parent individually.

Daphne Mayo was part of the Queensland National Art Gallery Education Committee, Queensland Combined Art Committee, and trustee of the Queensland Art Gallery. As a Trustee of the Godfrey Rivers Trust she played a substantial and active role in procuring art works for the Gallery.

Ledgers with expenses and income from rental property from 1937 to 1959, most of which were probably kept by her father until his death in 1954 and then by mother and/or Daphne. Ledgers kept by Daphne Mayo from 1960 to 1965 incorporate income and expenses for property, dividends and her profession. Folders contain correspondence, notes, invoices and receipts, and rental books for property in Highgate Hill, Brisbane.

Two folders of handwritten notes, in pencil, determined to be by Vida Lahey.

Daphne Mayo was nominated to act in an advisory capacity to the War Memorial Art Committee in May 1944. This subseries contains minutes for meetings and correspondence.