Sheets of United States, 1988
| Issuer | Date | Desc | State | ||
| - |  |
United States | 1988 | E rate, empty sheet (#595) | incomplete |
| - |  |
United States | 1988 | empty sheet (#596) | incomplete |
| - | no image | United States | 1988 | empty sheet (#597) | incomplete |
| - |  |
United States | 1988 | empty sheet (#598) | incomplete |
| - |  |
United States | 1988 | empty sheet (#599) | incomplete |
| - | no image | United States | 2/22/1988 | empty sheet (#15843) | incomplete |
| - | no image | United States | 4/29/1988 | empty sheet (#15844) | incomplete |
| - | no image | United States | 4/29/1988 | empty sheet (#15845) | incomplete |
| - | no image | United States | 5/3/1988 | empty sheet (#15841) | incomplete |
| - | no image | United States | 5/3/1988 | empty sheet (#15842) | incomplete |
| - | no image | United States | 5/28/1988 | empty sheet (#15846) | incomplete |
| - | no image | United States | 7/5/1988 | empty sheet (#15847) | incomplete |
| - | no image | United States | 8/22/1988 | empty sheet (#15849) | incomplete |
| - | no image | United States | 8/25/1988 | empty sheet (#15848) | incomplete |