Controversy over the existence of the world

Controversy over the existence of the world

Letter to the National Scientific Publishers written n/d

Letter to Jan Parandowski written 07.11.1965

Letter to the National Scientific Publishers written 31.01.1963

Postcard from Henryk Mehlberg written in n.d.

Letter to the National Scientific Publishers written 20.05.1964

Postcard from Henryk Mehlberg written in n.d. (2)

Letter from Irena Krońska written in 09.05.1947

Posctard from Juliusz Kleiner written 07.10.1947

Letter from Anna Teresa Tymieniecka written 15.01.1949

Letter to the Polish Academy of Science written 04.06.1966

Letter from Irena Krońska written in 07.08.1947

Postcard from Stefan Morawski written 05.12.1965