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TF225-United States Interstate Highway System
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TF224-The Rise of Florence
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TF223-Crown of Thorns Starfish and Coral Reefs
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TF222-The Dvaravati Civilization
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TF221-Eli Terry’s Clock
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TF220-Animal Behavior
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TF219-Day Length and Flowering Plants
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TF218-Impacts and Mass Extinctions
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TF217-Architectural Change in Eighth-Century Japan
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TF216-Origin of the Solar System
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TF215-Stone Tools and Pottery Fragments
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TF214-Agriculture in the Late Ottoman Empire
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TF213-Cereals and Legumes: A Partnership
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TF212-The Plow and the Horse in Medieval Europe
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TF211-Soil Fertilization
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TF203-Earth’s Energy Cycle
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TF200-Pest Control
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TF198-Environmental Impact of the Anasazi
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TF020-The Greek City-States: Sparta and Athens
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TF019-Circadian and Circannian Rhythms
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