| Year | 1939 |
| Date | 21-Dec |
| Volume | 81 |
| Issue | 2,015 |
| Page | 694 |
| Category | Model Aeronautics |
| Part | |
| Title | Theory and Practice of Model Aeroplane Building |
| Author | Lawrence H.Sparey |
| Notes | A fleet of Douglas D.C.2 airliners showing the retractable landing-gear, propellers, Mr Robert's mid-wing monoplane taking off |