Sheets of Mongolia, 1973
| Issuer | Date | Desc | State | ||
| - |  |
Mongolia | 3/20/1973 | empty sheet (#16795) | incomplete |
| - |  |
Mongolia | 4/15/1973 | empty sheet (#16796) | incomplete |
| - |  |
Mongolia | 10/26/1973 | Apollo and Soyuz, sheet of 1 type | all added |
| Issuer | Date | Desc | State | ||
| - | |
Mongolia | 3/20/1973 | empty sheet (#16795) | incomplete |
| - | |
Mongolia | 4/15/1973 | empty sheet (#16796) | incomplete |
| - | |
Mongolia | 10/26/1973 | Apollo and Soyuz, sheet of 1 type | all added |