Subjects: Stream plants--Juvenile literature; Stream ecology--Juvenile literature; Freshwater ecology--Juvenile literatureJUVENILE NONFICTION / Science & Nature / Earth Sciences / General; JUVENILE NONFICTION / Science & Nature / Environmental Science & Ecosystems
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Subjects: Freshwater ecology--Juvenile literature; Lakes--Juvenile literature; Rivers--Juvenile literatureJUVENILE NONFICTION / Science & Nature / Earth Sciences / Water (Oceans, Lakes, etc.)
Subjects: Fresh water--Juvenile literature; Freshwater ecology--Juvenile literature; Hydrologic cycle--Juvenile literatureSCIENCE / Life Sciences / Ecology; NATURE / Ecology; NATURE / Ecosystems & Habitats / Wilderness