• 

  Barrow [2] - Zeno.org

  http://www.zeno.org/Pierer-1857/A/Barrow+%5B2%5D

  Keine Beschreibung vorhanden.

• 

  Halford Mackinder und das Heartland | Heartland

  https://web.archive.org/web/20120709173954/http://theheartlandblog.wordpress.com/2012/07/01/halford-mackinder-und-das-heartland/

  Keine Beschreibung vorhanden.

---

---