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Pictures and simple text tell how a stream in a natural state, filters out impurities like mud, leaves, bugs, and other things.
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Editions
2 editions- Other · English · 1971Black · 9780713600391
- Other · English · 1960Clean BrookHarperCollins · 9780690195569
Freshwater biologyJuvenile literatureRiversFresh waterRivers, juvenile literatureFreshwater biology, juvenile literatureWater