I'm looking for November poems whose copyright has already expired – does that mean the poet has been dead for 75 years?

Hello, for my final school project, I would like to compare the coverage of certain events of the interwar period in Austria in various newspapers. Therefore, I have the following question: Which newspapers from the period from approximately 1924 to approximately 1938 can be attributed to the Schutzbund or the Heimwehr, or are there separate…