| Issuer | Date | Desc | State | ||
| - | no image | Chad | 1978 | empty sheet (#51279) | incomplete |
| - | no image | Chad | 9/13/1978 | empty sheet (#51278) | incomplete |
| - | |
Chad | 10/25/1978 | History of Aviation, sheet of 1 type | all added |
| - | no image | Chad | 12/30/1978 | empty sheet (#21473) | incomplete |