Sheets of Bulgaria, 1975
| Issuer | Date | Desc | State | ||
| - |  |
Bulgaria | 1975 | empty sheet (#5951) | incomplete |
| - |  |
Bulgaria | 1975 | empty sheet (#5952) | incomplete |
| - |  |
Bulgaria | 1975 | empty sheet (#5953) | incomplete |
| - |  |
Bulgaria | 6/6/1975 | empty sheet (#5957) | incomplete |
| - |  |
Bulgaria | 7/15/1975 | empty sheet (#5958) | incomplete |
| - |  |
Bulgaria | 8/22/1975 | empty sheet (#5955) | incomplete |
| - | no image | Bulgaria | 8/22/1975 | empty sheet (#5956) | incomplete |
| - |  |
Bulgaria | 10/29/1975 | empty sheet (#5950) | incomplete |
| - |  |
Bulgaria | 12/17/1975 | empty sheet (#5954) | incomplete |