"A very important black loose-leaf book in which I kept my maps, my records, my dates of birth and death for characters, and a great deal more detailed and difficult research material which proved invaluable. Missing from the book, but most useful when I was working, were the detailed maps I made of each locality. These were delivered to the map maker. "Also, a list of characters who appeared in more than one episode, or who were particularly important in the episode they did appear in. "Finally, a page which records the progress of the manuscript. For Chapters V on, the pages of the various drafts are given as of the date finished."