Issuer | Date | Desc | State | ||
- | Liberia | 1/6/1978 | Progress of Aviation, sheet of 1 type | ||
- | Liberia | 3/9/1978 | empty sheet (#34249) | incomplete | |
- | no image | Liberia | 6/1/1978 | empty sheet (#34250) | incomplete |
- | Liberia | 6/12/1978 | empty sheet (#34251) | incomplete | |
- | Liberia | 12/8/1978 | empty sheet (#34252) | incomplete |