o:1684802
Persistent identifier https://phaidra.univie.ac.at/o:1684801
Handle https://hdl.handle.net/11353/10.1684801
URI https://valep.vc.univie.ac.at/virtualarchive/public/Institute_for_the_Unity_of_Science_Philipp_Frank_to_Morris_1949-09-23_L/d:952544