Slovenia
Pošta Slovenije has collaborated a number of times with other postal administration to release a joint issue.
| Year | Postal Administration | Topic | Note |
|---|---|---|---|
| 2004 | Cyprus Czech Republic Latvia Lithuania Malta Slovakia Hungary Estonia |
Admission to the European Union | |
| 2012 | Hungary | Folk treasures of the Mura area and the Slovene Raba region |
Read more about this topic: Joint Issue