Sheets of Yemen, 1968
| Issuer | Date | Desc | State | ||
| - |  |
Yemen | 1/15/1968 | empty sheet (#16286) | incomplete |
| - |  |
Yemen | 6/1/1968 | empty sheet (#16259) | incomplete |
| - |  |
Yemen | 9/30/1968 | empty sheet (#16256) | incomplete |
| - |  |
Yemen | 10/18/1968 | empty sheet (#16254) | incomplete |
| - |  |
Yemen | 10/18/1968 | empty sheet (#16257) | incomplete |
| - |  |
Yemen | 10/20/1968 | empty sheet (#16258) | incomplete |
| - |  |
Yemen | 11/23/1968 | empty sheet (#16260) | incomplete |
| - |  |
Yemen | 12/22/1968 | empty sheet (#16255) | incomplete |