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).
Tabulated report showing total mileage and carbon percentage for designated items A to F.
| Identifier | ExFiles\Box 97\5\ scan0220 | |
| Date | 11th May 1939 guessed | |
| (2) Designation. Total Mileage. Carbon %. A 11,543 80 B 17,928 75 C 22,337 60 D 23,765 80 E 27,211 60 F 31,800 66 H1/SPS. | ||