o:1684252
Persistent identifier https://phaidra.univie.ac.at/o:1684251
Handle https://hdl.handle.net/11353/10.1684251
URI https://valep.vc.univie.ac.at/virtualarchive/public/Institute_for_the_Unity_of_Science_Philipp_Frank_to_University_of_Chicago_Press_1949-08-30_L/d:952006