Persistent identifier https://phaidra.univie.ac.at/o:1710693
Handle https://hdl.handle.net/11353/10.1710693
URI https://valep.vc.univie.ac.at/virtualarchive/public/Neurath_Institute_for_the_Unity_of_Science_to_Carnap_1938-05-16_L_Original/dv:950868