From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
List of experimental cars, B.3, B.50 and Silver Wraith.
| Identifier | ExFiles\Box 109\1\ scan0067 | |
| Date | 9th November 1938 | |
| 666. Rm.{William Robotham - Chief Engineer} Da{Bernard Day - Chassis Design}/Er. 31/N. 9.11.38. list of experimental cars, B.3, B.50 + Silver Wraith file 1021. | ||