1. Science Museum Library, M5371/1–4.
2. Ironbridge Gorge Museum Library, Mott Collection Boxes 7 and 8.
3. In my opinion, it is misleading to cite 'Mott' when quoting the book, because a lot of his work disappeared in the editing: I prefer to cite `Mott/Singer'.
4. Hertfordshire Record Office, A922/1.
5. Such as that quoted by Mott/Singer (p. 48), which is taken from leaf 154'.