753

Interview with Sylvia Morris (nee Heywood), 2015.

754

Ursula Duncan-Jones, unpublished memoir, p.c.

755

Barbara Pemberton, unpublished memoir, p.c.

756

Letter from Emily Boettcher to her parents, 9 January 1938; unpublished, undated biography edited by Elsa Heald, compiled from letters and other sources; Northwestern University Archives, Emily Boettcher Papers, Box 1, Folder 1, series 19/3/6.

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