1. Coleman Collection at the American Philosophical Society, Philadelphia, USA
2. B 0673: Mudge, George P.: Letter to William Bateson 3 December 1908.
3. B 1099: Mudge, George P.: Letter to William Bateson 13 January 1908.
4. John Innes Archives courtesy of the John Innes Foundation, Norwich, England
5. B 2663: Nettleship; Edward: Letter to William Bateson 12 December 1904.