CollanaUniversity of Knowledge
Autore della serie: Glenn Frank
- The Story of Man: His Earliest Appearance and Development to the Portals of History di Mabel Cook Cole
- The World We Live In and the People We Live With, More Travel: Treasures of Travel in Europe di Mason Warner
- The World We Live In and the People We Live With, Still More Travel: Marvels of Asia and the Orient di Mason Warner