1.
Letter from Henry Thurstan Holland, Viscount Knutsford to Helen Allingham, February 11, 1912
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3.
Letter from Henry Thurstan Holland, Viscount Knutsford to Helen Allingham, February 14, 1912
Letter from Henry Thurstan Holland, Viscount Knutsford to Helen Allingham, February 16, 1912
Note from Henry Thurstan Holland, Viscount Knutsford to Helen Allingham, October 5, 1913