Screening Nature and Nation: The Environmental Documentaries of the National Film Board, 1939-1974EbookScreening Nature and Nation: The Environmental Documentaries of the National Film Board, 1939-1974byMichael D.ClemensRating: 0 out of 5 stars0 ratingsSave Screening Nature and Nation: The Environmental Documentaries of the National Film Board, 1939-1974 for later