Science Stamp Thematic on WOPA+
Science
| National Scientists |
| Issued: 16.05.2019 |
| ›Costa Rica |
| The International Labour Organisation |
| Issued: 03.05.2019 |
| ›Portugal |
| One Small Step |
| Issued: 29.04.2019 |
| ›Isle of Man |
| The International Year of the Periodic Table of Chemical Elements |
| Issued: 12.04.2019 |
| ›Kyrgyzstan KEP |
| Clean Energy |
| Issued: 28.03.2019 |
| ›Costa Rica |
| Sustainable Energy |
| Issued: 30.11.2018 |
| ›Aruba |
| Minerals and Rocks |
| Issued: 24.10.2018 |
| ›Croatia |
| Minerals from Romania |
| Issued: 29.06.2018 |
| ›Romania |
| The Solar System |
| Issued: 09.05.2018 |
| ›Antigua and Barbuda |
| Electricity in Portugal |
| Issued: 19.03.2018 |
| ›Portugal |
| Yuri Oganessian |
| Issued: 28.12.2017 |
| ›Armenia |
| 60 Years of the Space Age |
| Issued: 16.11.2017 |
| ›Kyrgyzstan KEP |
| Alderney Coastal Eclipses |
| Issued: 19.07.2017 |
| ›Alderney |
| Minerals and Rocks |
| Issued: 24.10.2016 |
| ›Croatia |
| Beyond the frontiers of knowledge, Laser Valley – Land of Lights |
| Issued: 16.10.2016 |
| ›Romania |
| The Minerals of Kyrgyzstan |
| Issued: 31.12.2015 |
| ›Kyrgyzstan KEP |
| Innovation and Research - National Institute, 45 years |
| Issued: 05.06.2015 |
| ›Romania |
| International Telecommunication Union’s 150th Anniversary |
| Issued: 15.05.2015 |
| ›Serbia |