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  1. Normal spine, X-ray
  2. Close Ups Of Fortification On Crazy Lace Agate
  3. Brain, artwork
  4. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  5. Van Gogh from Space - USGS Earth as Art
  6. Bronchial tree and lungs, artwork
  7. Cosmic Periodic Table
  8. Winston Churchill
  9. Nelson Mandela
  10. Pastel Periodic Table - Modern Text
  11. Pietersite
  12. Agate Geode I
  13. Desk Tools I
  14. Desk Tools III
  15. Highlights from History: Ireland's 'Great Rebellion'
  16. Digestive system, artwork
  17. Photomicroscopic close up of a snowflake crystal
  18. Pennsylvania, Gettysburg, Battle of Gettysburg, tree and battlefield monument, dawn
  19. Dental X-ray
  20. Wright Flyer sculpture at Wright Brothers National Memorial, North Carolina
  21. Bees - Vintage Educational Poster
  22. Alternating Motor - Blue
  23. The Tea Party II
  24. Conceptual image of neuron
  25. The bones of the neck
  26. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  27. The four terrestrial planets compared in scale
  28. Geometry tools
  29. Colorized image of HIV-infected H9 T-cell
  30. Agate Geode II
  31. Ice Stars - USGS Earth as Art
  32. Jordan - USGS Earth as Art
  33. Presidential portrait of President George H.W. Bush
  34. Edrengiyn Nuruu - USGS Earth as Art
  35. Liver proteins
  36. Energy
  37. San Luis, Argentina - USGS Earth as Art
  38. Neanderthals hunt a cave bear
  39. Book Cover of 'Jeanne d'Arc'
  40. Antique French Grape Press
  41. Female human head with brain
  42. Niger River - USGS Earth as Art
  43. Conceptual image of DNA
  44. Cindarella With Pumpkin And Mice
  45. Atlas Mountains - USGS Earth as Art
  46. Sulaiman Mountains - USGS Earth as Art
  47. Abraham Lincoln
  48. The cervical vertebrae