From the author's site:
"I have spent five years travelling all over the world to secure original documents from the Second World War and the 1930`s, to write a book about piston engine development “in their own words”.
"Two thirds of the materials in the book is quotes from original letters, memos and technical reports, many of which have never been seen before, and hundreds of primary archival sources are referenced.
Archives I have used to research this book include:
- Bundesarchiv Militärarchiv – Freiburg, Germany
- Daimler-AG, Corporate Archives, Germany
- Farnborough Air Sciences Trust, Farnborough, UK
- Institute of Mechanical Engineers, London, UK
- Imperial War Museum, UK
- NASA – Langley Research Centre, Virginia
- MAHLE Powertrain
- RAF Historical Branch, UK
- Ricardo, Shoreham, UK
- Rolls-Royce, Derby, UK
- Technikmuseum Hugo Junkers, Dessau, Germany
- The National Air and Space Museum – Washington DC
- The National Archives – Washington DC
- The National Archives – London, UK"