Sheets of Mongolia, 1988
| Issuer | Date | Desc | State | ||
| - |  |
Mongolia | 1/20/1988 | empty sheet (#16901) | incomplete |
| - |  |
Mongolia | 2/20/1988 | empty sheet (#16902) | incomplete |
| - |  |
Mongolia | 3/15/1988 | empty sheet (#16903) | incomplete |
| - |  |
Mongolia | 4/15/1988 | empty sheet (#16904) | incomplete |
| - |  |
Mongolia | 6/5/1988 | empty sheet (#16905) | incomplete |
| - |  |
Mongolia | 11/25/1988 | empty sheet (#16906) | incomplete |
| - |  |
Mongolia | 11/30/1988 | empty sheet (#16907) | incomplete |
| - |  |
Mongolia | 12/20/1988 | empty sheet (#16908) | incomplete |