A Preventable Event
Clip: Season 1 | 9m 39s
Need to Know's John Larson reports on just-released findings of an investigation into what caused last year's deadly West Virginia coal mine explosion.
Aired: 05/19/11
Expired: 05/20/16
Clip: Season 1 | 9m 39s
Need to Know's John Larson reports on just-released findings of an investigation into what caused last year's deadly West Virginia coal mine explosion.
Aired: 05/19/11
Expired: 05/20/16
