Sheets of Bulgaria, 1988
| Issuer | Date | Desc | State | ||
| - |  |
Bulgaria | 1/25/1988 | empty sheet (#6183) | incomplete |
| - |  |
Bulgaria | 3/25/1988 | empty sheet (#6184) | incomplete |
| - |  |
Bulgaria | 4/28/1988 | empty sheet (#6191) | incomplete |
| - |  |
Bulgaria | 4/28/1988 | empty sheet (#6192) | incomplete |
| - |  |
Bulgaria | 5/20/1988 | empty sheet (#6185) | incomplete |
| - |  |
Bulgaria | 6/7/1988 | empty sheet (#6186) | incomplete |
| - |  |
Bulgaria | 6/10/1988 | empty sheet (#6193) | incomplete |
| - | no image | Bulgaria | 6/10/1988 | empty sheet (#6194) | incomplete |
| - | no image | Bulgaria | 6/10/1988 | empty sheet (#6195) | incomplete |
| - |  |
Bulgaria | 6/10/1988 | empty sheet (#6196) | incomplete |
| - |  |
Bulgaria | 6/16/1988 | empty sheet (#6197) | incomplete |
| - |  |
Bulgaria | 6/16/1988 | empty sheet (#6198) | incomplete |
| - |  |
Bulgaria | 7/25/1988 | empty sheet (#6199) | incomplete |
| - |  |
Bulgaria | 7/25/1988 | empty sheet (#6200) | incomplete |
| - |  |
Bulgaria | 8/22/1988 | empty sheet (#6187) | incomplete |
| - |  |
Bulgaria | 9/1/1988 | empty sheet (#6188) | incomplete |
| - |  |
Bulgaria | 9/26/1988 | empty sheet (#6189) | incomplete |
| - |  |
Bulgaria | 11/24/1988 | empty sheet (#6190) | incomplete |
| - |  |
Bulgaria | 11/25/1988 | empty sheet (#6201) | incomplete |
| - |  |
Bulgaria | 11/25/1988 | empty sheet (#6202) | incomplete |
| - |  |
Bulgaria | 11/25/1988 | empty sheet (#6205) | incomplete |
| - |  |
Bulgaria | 12/29/1988 | empty sheet (#6203) | incomplete |
| - |  |
Bulgaria | 12/30/1988 | empty sheet (#6204) | incomplete |