Search for: [Subject and Keywords = Polish Legions] OR [Subject and Keywords = field fortifications] OR [Subject and Keywords = austro\-hungarian soldiers] OR [Subject and Keywords = postcards] OR [Subject and Keywords = front wschodni] OR [Subject and Keywords = umocnienia polowe] OR [Subject and Keywords = żołnierze austro\-węgierscy] OR [Subject and Keywords = karty pocztowe] OR [Title = \[Platzkommando w ukryciu ziemnym\]]