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  1. Timeline of Life on Earth
  2. Wild West
  3. University of Virginia, Charlottesville, Virginia
  4. Bronchial tree and lungs, artwork
  5. Mississippi River Delta - USGS Earth as Art
  6. Winston Churchill
  7. Chrysocolla
  8. Agate Geode I
  9. Edwin Hubble's Galaxy Classification System
  10. Tesla
  11. Conceptual image of DNA
  12. The bones of the head, neck and face
  13. 'Rheumatoid arthritis of the hands, X-ray
  14. Chinese acupuncture model
  15. Pennsylvania, Gettysburg, Battle of Gettysburg, tree and battlefield monument, dawn
  16. Bright Periodic Table - White, Classic Text
  17. Teacher's desk in classroom
  18. Wright Flyer sculpture at Wright Brothers National Memorial, North Carolina
  19. Neptune
  20. Conversion
  21. Alice and The Cheshire Cat
  22. The Best Teachers
  23. Conceptual image of neuron
  24. A simplified Herzprung Russell Diagram showing how stars are classified
  25. Utah - USGS State Mosaic
  26. The bones of the neck
  27. United States Fun Facts
  28. Wilson Dam, Alabama, forms portion of the Tennessee River barge route
  29. Laboratory Equipments
  30. Colorized image of HIV-infected H9 T-cell
  31. Caribbean Luxury - USGS Earth as Art
  32. Gem Stones III
  33. Montana - USGS State Mosaic
  34. Wright Flyer sculpture at Wright Brothers National Memorial, North Carolina
  35. The Battle of Cannae in 216 BC
  36. Ice Stars - USGS Earth as Art
  37. Island Rebound - USGS Earth as Art
  38. The cervical vertebrae
  39. Wyoming - USGS State Mosaic
  40. Vermont - USGS State Mosaic
  41. Male skeleton, computer artwork.
  42. Deforestation
  43. Abraham Lincoln
  44. Alphabet For Children, 2002
  45. Italy, Sicily, Siracusa, Monte Lauro, wind turbine
  46. St. Francis Xavier University, Antigonish, Nova Scotia, Canada
  47. Alluvial Fan - USGS Earth as Art