Sheets of Bulgaria, 1971
| Issuer | Date | Desc | State | ||
| - |  |
Bulgaria | 3/14/1971 | sheet of 3 types | incomplete |
| - |  |
Bulgaria | 4/12/1971 | empty sheet (#5919) | incomplete |
| - |  |
Bulgaria | 9/25/1971 | Winter Olympics 1972, empty sheet (#5920) | incomplete |
| - |  |
Bulgaria | 12/20/1971 | empty sheet (#5921) | incomplete |