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  1. Close Ups Of Fortification On Crazy Lace Agate
  2. Brain, artwork
  3. Normal spine, X-ray
  4. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  5. Bronchial tree and lungs, artwork
  6. Cosmic Periodic Table
  7. Winston Churchill
  8. Pastel Periodic Table - Modern Text
  9. Nelson Mandela
  10. Van Gogh from Space - USGS Earth as Art
  11. Pietersite
  12. Agate Geode I
  13. Desk Tools I
  14. Desk Tools III
  15. Digestive system, artwork
  16. Highlights from History: Ireland's 'Great Rebellion'
  17. Photomicroscopic close up of a snowflake crystal
  18. Dental X-ray
  19. Pennsylvania, Gettysburg, Battle of Gettysburg, tree and battlefield monument, dawn
  20. Bees - Vintage Educational Poster
  21. Wright Flyer sculpture at Wright Brothers National Memorial, North Carolina
  22. Conceptual image of neuron
  23. The Tea Party II
  24. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  25. Alternating Motor - Blue
  26. The bones of the neck
  27. The four terrestrial planets compared in scale
  28. Geometry tools
  29. Colorized image of HIV-infected H9 T-cell
  30. Ice Stars - USGS Earth as Art
  31. Jordan - USGS Earth as Art
  32. Presidential portrait of President George H.W. Bush
  33. Edrengiyn Nuruu - USGS Earth as Art
  34. Liver proteins
  35. Energy
  36. San Luis, Argentina - USGS Earth as Art
  37. Neanderthals hunt a cave bear
  38. Book Cover of 'Jeanne d'Arc'
  39. Antique French Grape Press
  40. Female human head with brain
  41. Abraham Lincoln
  42. Conceptual image of DNA
  43. Cindarella With Pumpkin And Mice
  44. Man using laptop computer
  45. The cervical vertebrae
  46. Italy, Sicily, Siracusa, Monte Lauro, wind turbine
  47. Alluvial Fan - USGS Earth as Art
  48. STS-128 Mission