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  • TF225-United States Interstate Highway System
    2023-06-09
  • TF224-The Rise of Florence
    2023-06-09
  • TF223-Crown of Thorns Starfish and Coral Reefs
    2023-06-09
  • TF222-The Dvaravati Civilization
    2023-06-09
  • TF221-Eli Terry’s Clock
    2023-06-09
  • TF220-Animal Behavior
    2023-06-08
  • TF219-Day Length and Flowering Plants
    2023-06-08
  • TF218-Impacts and Mass Extinctions
    2023-06-08
  • TF217-Architectural Change in Eighth-Century Japan
    2023-06-08
  • TF216-Origin of the Solar System
    2023-06-08
  • TF215-Stone Tools and Pottery Fragments
    2023-06-07
  • TF214-Agriculture in the Late Ottoman Empire
    2023-06-07
  • TF213-Cereals and Legumes: A Partnership
    2023-06-07
  • TF212-The Plow and the Horse in Medieval Europe
    2023-06-07
  • TF211-Soil Fertilization
    2023-06-07
  • TF203-Earth’s Energy Cycle
    2023-06-02
  • TF200-Pest Control
    2023-06-01
  • TF198-Environmental Impact of the Anasazi
    2023-06-01
  • TF020-The Greek City-States: Sparta and Athens
    2023-04-09
  • TF019-Circadian and Circannian Rhythms
    2023-04-09
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