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  1. Too Much of a Good Thing (1982 Video)

    Subject
    Chemistry
    Distribution
    OUT OF DISTRIBUTION, Videocassette. Standard formats. col. 25 min.

    Discusses phosphorus pollution in waterways and lakes. Gives a background to the uses, chemistry and manufacture of phosphorus products. Depicts the eutrophication that is prevalent in the Great Lakes and...

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  2. Flevoland Polders: A Managed Succession (1986 Video)

    Producer
    Tony Jolly
    Subject
    Biology; Environmental science
    Distribution
    OUT OF DISTRIBUTION, Videocassette. Standard formats. col. 24 min.

    Shows how the hydrosere succession has been ‘managed’ in the Dutch polders to produce a variety of habitats and land types. Following exclosure from the sea, the shallow freshwater lakes and marshes that...

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  3. Blelham Tubes (1984 Video)

    Producer
    Aileen Llewellyn
    Subject
    Biology; Environmental science
    Distribution
    OUT OF DISTRIBUTION, Videocassette. Standard formats. col. 25 min.

    Using giant plastic tubes, the Freshwater Biological Association created model lakes within a natural lake, Blelham Tarn, and they began an investigation into the primary production of freshwater algae that...

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