Sheets of Mongolia, 1990
| Issuer | Date | Desc | State | ||
| - |  |
Mongolia | 3/30/1990 | World Cup 1990, sheet of 1 type | all added |
| - |  |
Mongolia | 4/1/1990 | STAMP WORLD LONDON '90, sheet of 1 type | all added |
| - |  |
Mongolia | 4/10/1990 | empty sheet (#16920) | incomplete |
| - |  |
Mongolia | 5/8/1990 | 800th Anniversary of the Coronation of Genghis Khan, sheet of 1 type | all added |
| - |  |
Mongolia | 5/8/1990 | 800th Anniversary of the Coronation of Genghis Khan, sheet of 1 type | incomplete |
| - |  |
Mongolia | 6/20/1990 | sheet of 1 type | all added |
| - |  |
Mongolia | 8/13/1990 | 750th Anniversary of the Publication of "Secret History of the Mongols", sheet of 8 types | incomplete |
| - |  |
Mongolia | 8/18/1990 | empty sheet (#16927) | incomplete |
| - |  |
Mongolia | 8/25/1990 | sheet of 1 type | incomplete |
| - |  |
Mongolia | 9/25/1990 | sheet of 1 type | incomplete |
| - |  |
Mongolia | 10/25/1990 | sheet of 1 type | all added |
| - |  |
Mongolia | 11/25/1990 | sheet of 1 type | all added |