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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. Indigo Agate C
  10. South American Independence
  11. Famous prehistoric rock paintings of Tassili N'Ajjer, Algeria
  12. Ball Play Of the Choctaw, 1840s
  13. General Curtis LeMay and President Kennedy
  14. Space Suit
  15. Spatial dimensions, conceptual artwork
  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. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  28. Flatboat, 19th Century
  29. The Planets, excluding Pluto
  30. The Rainforest
  31. Living Relatives of Dinoaurs
  32. A Mad Teaparty By Charles Folkard
  33. Titanic survivors in lifeboat
  34. The Sinking of the Laconia in 1942
  35. Frank Whittle's early development of the jet engine
  36. Houdini Diver Suit
  37. Mars
  38. Decorative Lintel from the ancient Mayan city of Yaxchilan, Chiapas, Mexico
  39. Superior view of human brain with colored lobes and labels
  40. Purple Watercolor Agate I
  41. Vitruvian Skeleton
  42. Moss Agate
  43. Desk Tools I
  44. Map Of the Battle Of Gettysburg, 1863
  45. Von Karman Vortices - USGS Earth as Art
  46. Sohrab Facing the Tent of the Persian Army Leaders. Shahnameh. The Book of Kings. 16th c
  47. The bones of the jaw
  48. Pi to 2198 decimal place