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  1. Molecule Testosterone
  2. Wyoming - USGS State Mosaic
  3. Cingulate gyrus in the brain, artwork
  4. David Copperfield. Illustration for the Charles Dickens novel David Copperfield
  5. Oregon. Close-up of Owyhee Picture Jasper stone
  6. Mt. Etna - USGS Earth as Art
  7. Ambassador George Bush
  8. Conceptual image of platelet, red blood cell and white blood cell
  9. Boxing
  10. Oregon - USGS State Mosaic
  11. San Luis, Argentina - USGS Earth as Art
  12. Molecule Estrogene
  13. Rocky Mountains - USGS Earth as Art
  14. Internal view of the human heart
  15. Illustration of strip of land known as the 'fertile crescent'
  16. Terracotta Army
  17. Vintage Civil War Print of General Ulysses S. Grant
  18. Roof of the World - USGS Earth as Art
  19. Neanderthals hunt a cave bear
  20. Male skeleton, computer artwork.
  21. Peter and the Mermaids
  22. Map of Palestine, Palestina Antiqua
  23. Relief depiction of Ramses II, Temple of Luxor, Egypt
  24. Gold Leaf Agate
  25. Harriet Tubman, 1911
  26. Blood clot, SEM
  27. Alice and the White Knight, from 'Alice in Wonderland' by Lewis Carroll
  28. World War I, Map, c1918
  29. Marie Curie
  30. Book Cover of 'Jeanne d'Arc'
  31. Tyrannosaurus
  32. Ida B. Wells
  33. Sigmund Freud
  34. old-fashioned drawing compass
  35. Dice on math game
  36. Antique French Grape Press
  37. Lovecraft
  38. Deinonychus
  39. Anterior view of human skull, with labels
  40. Anterior neck and facial muscles of the human head (with labels)
  41. Alaska - USGS State Mosaic
  42. Barreal Blanco - USGS Earth as Art
  43. Map Of France, C.1900
  44. Solar System - Brown
  45. Portrait of General William Tecumseh Sherman (1820-91)
  46. Be Creative
  47. Yellowstone
  48. Row of pencils on table