Born at Dunkery, Park Road,
Barnet on 17 August 1924, Wallis was the daughter of Leonard Francis Wallis (1880–1965), headmaster, and Mary McCulloch Jones (1884–1957), teacher.
Cartographical innovations, and the ''Historians' guide to early British maps''. She retired from the British Library in 1986, then died of cancer on 7 February 1995 at the Hospital of St John and St Elizabeth in
St John's Wood, London. ==Honours and awards==