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  1. Portrait Of Harriet Tubman, 1868-69
  2. Antique Stock Certificate IV
  3. Stethoscope
  4. Arthritis of the knee, X-ray
  5. A composite showing different stages of the 2010 solstice total moon eclipse
  6. Apache Men, c1906
  7. Colon blood vessels, light micrograph
  8. Photograph of logarithmic slide rule
  9. Indigo Agate C
  10. Famous prehistoric rock paintings of Tassili N'Ajjer, Algeria
  11. Ball Play Of the Choctaw, 1840s
  12. South American Independence
  13. General Curtis LeMay and President Kennedy
  14. Spatial dimensions, conceptual artwork
  15. The Quack Frog, illustration from Aesop's Fables
  16. Austenaco, Great Warrior, Commander in Chief of the Cherokee Nation
  17. Vintage American Civil War print of The Battle of Cherbourg
  18. Space Suit
  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. Agate Studies IV
  25. Solar System (Colored)
  26. Earth Agate E
  27. Flatboat, 19th Century
  28. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  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. Vitruvian Skeleton
  35. The Sinking of the Laconia in 1942
  36. Frank Whittle's early development of the jet engine
  37. Houdini Diver Suit
  38. Mars
  39. Superior view of human brain with colored lobes and labels
  40. Purple Watercolor Agate I
  41. Moss Agate
  42. Desk Tools I
  43. Map Of the Battle Of Gettysburg, 1863
  44. Von Karman Vortices - USGS Earth as Art
  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