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  1. Only Four Colours (1995 Video)

    Producer
    David Saunders
    Subject
    Design; Mathematics
    Distribution
    Off-air recording licence Sale, Videocassette. Standard formats. col. 24 min., 1999 sale: £145.00 (+VAT +p&p)

    A century ago it was ‘proved’ that only four colours were needed to colour a map. Kempe’s proof of the four-colour theorem and the counter-example by Heawood are presented in a dramatised...

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  2. Water Under the Earth (1981 Film)

    Producer
    Colin Willock
    Subject
    Biology
    Distribution
    Film (16mm)

    The Ichtetucknee State National Park in Florida encloses a huge spring system of freshwater up-welling from airless waterless caverns. Explores the ecology of this unusual environment. The clear water,...

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