Sheets of Tanzania, 1991 all added
| Issuer | Date | Desc | State | ||
| - |  |
Tanzania | 10/28/1991 | African Elephant, sheet of 16 types | all added |
| - |  |
Tanzania | 10/28/1991 | Pet Birds, sheet of 16 types | all added |
| - |  |
Tanzania | 11/28/1991 | Elephants, sheet of 1 type | all added |
| - |  |
Tanzania | 12/30/1991 | Fish, sheet of 1 type | all added |