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Secret life of a trout river / [Videorecording] /National Geographic Society.

by National Geographic Society (U.S.).
Material type: materialTypeLabelBookSeries: Bio-science series ; 51198. Publisher: Washington, D.C. : National Geographic Society, c1974, 1986Description: 1 videocassette (10 min.) ; sd., col. ; 1/2 in + 2 teacher's guides.Subject(s): Stream ecology | TroutSummary: Discusses the eco-system of a trout stream. Focuses on the mayfly, the trout, the dipper, and the pike as elements of a food chain.
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Also issued as a 16 mm motion picture.

Discusses the eco-system of a trout stream. Focuses on the mayfly, the trout, the dipper, and the pike as elements of a food chain.

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