the letters of rosa luxemburg

https://www.marxists.org/archive/luxemburg/posthumous/lettersofrosaluxemburg-1922.pdf

https://thecharnelhouse.org/wp-content/uploads/2021/03/Rosa-Luxemburg-Comrade-and-Lover-Letters-to-Leo-Jogiches.pdf

https://archive.org/details/lettersofrosalux0000unse/page/n1/mode/2up