Search for: [Subject and Keywords = origin of languages \-\- theories] OR [Subject and Keywords = linguistic] OR [Subject and Keywords = pre\-Indo\-European languages] OR [Subject and Keywords = pochodzenie języków \-\- teorie] OR [Subject and Keywords = językoznawstwo] OR [Subject and Keywords = przedindoeuropejski substrat językowy] OR [Title = N. Marr ...] OR [Creator = Sawicki, Ludwik \(1893–1972\)]