8.6 2012 – Undaunted: The Forgotten Giants of the Allegheny Observatory Apr. 18, 2012 2012 – Undaunted: The Forgotten Giants of the Allegheny Observatory IMDb: 8.6 2012 62 min Undaunted: The Forgotten Giants of the Allegheny Observatory / Undaunted: The Forgotten Giants of the Allegheny Observatory – 2012: Dokumenter