Sheets of United States, 1978
| Issuer | Date | Desc | State | ||
| - |  |
United States | 1978 | empty sheet (#249) | incomplete |
| X |  |
United States | 1978 | CAPEX 78, sheet of 8 types | |
| - |  |
United States | 1978 | empty sheet (#251) | incomplete |
| - |  |
United States | 1978 | empty sheet (#252) | incomplete |
| - |  |
United States | 1978 | sheet of 1 type | all added |