The information presented on this website comes from a variety of sources: most are public, some private. Most come from original documents rather than interviews or memoirs. Many are held in published or publicly-available sources.

I am reluctant in this essentially temporary medium to quote chapter and verse about these sources. History is a competitive sport: some students and academics are only too keen to take a short cut by plundering the research efforts of others and claiming it as their own. When this project takes more concrete form my sources will be published in greater detail.

Some source-materials, mostly logbooks and diaries, are in private hands. To ensure their privacy I shall not identify online those individuals who have been generous with their own documents and time, but I very much appreciate their assistance: more personal thanks will be possible in print. The same principle applies for individuals or members of staff in the organisations listed below. Without their assistance my investigations would not have been possible.