The 20th Anniversary of the Chandra X-ray Observatory 2019
2020-2023ただいま表示中： Sierra Leone 2018-Present - 郵便切手 - 2019 - The 20th Anniversary of the Chandra X-ray Observatory - 4 切手.
ただいま表示中： Sierra Leone 2018-Present - 郵便切手 - 2019 - The 20th Anniversary of the Chandra X-ray Observatory - 4 切手.
![[The 20th Anniversary of the Chandra X-ray Observatory, タイプ ]](https://www.stampworld.com/media/catalogue/Sierra-Leone-2018_Present/Postage-stamps/0894-b.jpg)
