Ceskoslovensk ̀astronomick ̀spolecnost.
Czechoslovak Astronomical Society records, 1917-1959.
Astronomy -- Societies, etc. -- Czechoslovakia.
Chechoslovak Astronomical Society.
AIP-ICOS
Archiv Akademie v d esk ̌Republiky. Central Archiv. V Zm̀cc̕h 56/76, 181 00 Praha 8 - Bohnice.