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  1. Mars
  2. Superior view of human brain with colored lobes and labels
  3. Famous prehistoric rock paintings of Tassili N'Ajjer, Algeria
  4. A Mad Teaparty By Charles Folkard
  5. Arthritis of the knee, X-ray
  6. Stethoscope
  7. Agate Studies IV
  8. Bright Periodic Table - White, Modern Text
  9. Vintage Civil War print of Abraham Lincoln riding on horseback as a crowd cheers
  10. Space Suit
  11. Sir John Hawkins (1532-95)
  12. Colon blood vessels, light micrograph
  13. Molecule Chili
  14. South American Independence
  15. Lena Delta - USGS Earth as Art
  16. Apache Men, c1906
  17. A composite showing different stages of the 2010 solstice total moon eclipse
  18. Spatial dimensions, conceptual artwork
  19. Flatboat, 19th Century
  20. Ball Play Of the Choctaw, 1840s
  21. Photograph of logarithmic slide rule
  22. Blackfoot Native American
  23. Vitruvian Skeleton
  24. Solar System (Colored)
  25. Indigo Agate C
  26. Map Of the Battle Of Gettysburg, 1863
  27. The Planets, excluding Pluto
  28. Austenaco, Great Warrior, Commander in Chief of the Cherokee Nation
  29. The Quack Frog, illustration from Aesop's Fables
  30. Watercolor Agate I
  31. The Rainforest
  32. Portrait Of Harriet Tubman, 1868-69
  33. Agate Geode I
  34. Study of the Human Figure, Lateral View
  35. Van Gogh from Space - USGS Earth as Art
  36. Edwin Hubble's Galaxy Classification System
  37. General Curtis LeMay and President Kennedy
  38. The Sinking of the Laconia in 1942
  39. Mississippi River Delta - USGS Earth as Art
  40. Living Relatives of Dinoaurs
  41. Frank Whittle's early development of the jet engine
  42. Titanic survivors in lifeboat
  43. Houdini Diver Suit
  44. RMS Titanic departing from Southanpton on her maiden voyage, April 5, 1912
  45. Decorative Lintel from the ancient Mayan city of Yaxchilan, Chiapas, Mexico
  46. Desk Tools I
  47. Poe
  48. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper