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  1. Pietersite
  2. Portrait Of Harriet Tubman, 1868-69
  3. Antique Stock Certificate IV
  4. Arthritis of the knee, X-ray
  5. A composite showing different stages of the 2010 solstice total moon eclipse
  6. Colon blood vessels, light micrograph
  7. Apache Men, c1906
  8. Photograph of logarithmic slide rule
  9. Ball Play Of the Choctaw, 1840s
  10. Indigo Agate C
  11. Famous prehistoric rock paintings of Tassili N'Ajjer, Algeria
  12. South American Independence
  13. General Curtis LeMay and President Kennedy
  14. Spatial dimensions, conceptual artwork
  15. Space Suit
  16. Vintage American Civil War print of The Battle of Cherbourg
  17. Austenaco, Great Warrior, Commander in Chief of the Cherokee Nation
  18. The Quack Frog, illustration from Aesop's Fables
  19. Stacked Agate I
  20. Watercolor Agate I
  21. Study of the Human Figure, Lateral View
  22. Agate Geode I
  23. Stacked Agate II
  24. Solar System (Colored)
  25. Agate Studies IV
  26. Earth Agate E
  27. Flatboat, 19th Century
  28. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  29. The Planets, excluding Pluto
  30. Living Relatives of Dinoaurs
  31. The Rainforest
  32. A Mad Teaparty By Charles Folkard
  33. Titanic survivors in lifeboat
  34. Frank Whittle's early development of the jet engine
  35. Houdini Diver Suit
  36. The Sinking of the Laconia in 1942
  37. Mars
  38. Superior view of human brain with colored lobes and labels
  39. Purple Watercolor Agate I
  40. Vitruvian Skeleton
  41. Moss Agate
  42. Desk Tools I
  43. Von Karman Vortices - USGS Earth as Art
  44. Map Of the Battle Of Gettysburg, 1863
  45. Decorative Lintel from the ancient Mayan city of Yaxchilan, Chiapas, Mexico
  46. Sohrab Facing the Tent of the Persian Army Leaders. Shahnameh. The Book of Kings. 16th c
  47. Pi to 2198 decimal place
  48. The bones of the jaw