'European Friends 1953.' This series is presumably named thus because the letters were sent to HMC during her time at Harvard. In spite of the title the letters actually date from 1950 to 1954. The most prolific correspondents (chiefly former Girton College colleagues) include the following:
Bradbrook, Muriel (14 letters)
Cartwright, Mary (7 letters)
Jeffreys, Bertha (6 letters)
Jenkins, C[eline] (13 letters)
Jenner, Margaret (7 letters)
Jones, M G (19 letters)
Lindsay, Jean (6 letters)
Keynes, Florence A (6 letters)
McMorran, Helen (8 letters)
Matthews, Florence (8 letters)
Raven, Charles E (6 letters)
'Peter' [Petronella? Neville Smith] (32 letters)
Sondheimer, Janet (8 letters)
Street, Fanny (15 letters)
Wells, Anna (6 letters)

See composite name index to the catalogue for names of individual correspondents.