Letters relating to Helen Keller Two letters, with signatures, dated Oct 1946 and 27 Feb 1951, from Helen Keller to Ailsa McMahon, Deputy Headmistress of Copnor Modern Girls' School, Portsmouth. Also a letter from Miss McMahon to the Royal National Institute for the Deaf (now known as RNID) Information Department, written in May 1986 explaining the association between the school and Helen Keller. 1946-1986