Undaunted: The Forgotten Giants of the Allegheny Observatory2012 · 1 h 02 · DocumentaireDe Dan HandleyMon avisSe connecter pour noter ce filmDistributionCain AlexanderYoung Samuel LangleyKKurt BellSelfRRobert R. BellJosiah KingLLen CaricHarvey ChildsDavid ConradNarrator