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David J. Smith
1: If
2: Our Galaxy
3: The Planets
4: History of the Earth
5: Life on Earth
6: Events of the Last 3000 Years
7: Inventions through Time
8: Inventions of the Last 1000 Years
9: The Continents
10: Water
11: Species of Living Things
12: Money
13: Energy
14: Life Expectancy
15: Population
16: Food
17: Your Life
18: A Note for Parents and Teachers
19: Sources
