He is also advising Ken Burns on a forthcoming PBS series on the national parks .
Recently , Runte completed a history of railroads and the environment : Allies of the Earth : Railroads and the Soul of Preservation .
Runte is also advising Ken Burns on a forthcoming PBS series on the national parks .
Recently , Runte completed a history of railroads and the environment : Allies of the Earth : Railroads and the Soul of Preservation .