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• file:S2_Terrible_Tyrannosaurs.pdf
• file:S2_earthquakes.pdf
• file:65 You're Aboard Spaceship Earth-1.pdf
• file:64 Why Are the Ice Caps Melting-1.pdf
• file:63 What's So Bad About Gasoline-1.pdf
• file:62 Volcano.pdf
• file:61 Oil Spill!-1.pdf
• file:60 Let's Go Rock Collecting-1.pdf
• file:59 How Mountains Are Made-1.pdf
• file:58 Follow the Water from Brook to Ocean-1.pdf
• file:56 Archaeologists Dig for Clues-1.pdf