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  1. Portrait Of Harriet Tubman, 1868-69
  2. Antique Stock Certificate IV
  3. Arthritis of the knee, X-ray
  4. A composite showing different stages of the 2010 solstice total moon eclipse
  5. Apache Men, c1906
  6. Stethoscope
  7. Photograph of logarithmic slide rule
  8. Indigo Agate C
  9. Famous prehistoric rock paintings of Tassili N'Ajjer, Algeria
  10. South American Independence
  11. General Curtis LeMay and President Kennedy
  12. Colon blood vessels, light micrograph
  13. Spatial dimensions, conceptual artwork
  14. Space Suit
  15. Ball Play Of the Choctaw, 1840s
  16. Austenaco, Great Warrior, Commander in Chief of the Cherokee Nation
  17. Vintage American Civil War print of The Battle of Cherbourg
  18. Stacked Agate I
  19. Watercolor Agate I
  20. The Quack Frog, illustration from Aesop's Fables
  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. 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. Vitruvian Skeleton
  33. Titanic survivors in lifeboat
  34. A Mad Teaparty By Charles Folkard
  35. Frank Whittle's early development of the jet engine
  36. The Sinking of the Laconia in 1942
  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. 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. The bones of the jaw
  48. Pi to 2198 decimal place