Cover from Latvia

"100 years of the Republic of Latvia. 1918-2018.".

"Science" : "Astrophysics", "Medicine" and "Chemistry"  

Friedrich Zander – built the first Soviet rocket engine on liquid fuel. Born in Riga.

   Karlis Shtein, Janis Ikaunieks and Arthur Balklavs – astronomers.In the background of the stamp drawn: the rocket, the satellite "Venta-1" ( launched on an Indian rocket PSLV C-38 June 23, 2017), starry sky with nebula and astronomical Observatory.

Date of Issue : 3 November 2017

Received this cover from Latvia. Thanks Evgenii Limanski For this beautiful cover.