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  1. Patent--Light Bulb
  2. Hairdresser
  3. Vintage Parchment Tesla Operating Electric Motors Map Poster
  4. Practical Mechanics, November 1955
  5. The Outward Bound, 1912
  6. Marie Curie
  7. Stamp out Syphilis and Gonorrhea - WPA Poster
  8. Christian's Conflict With Apollyon. From The Book The Pilgrim's Progress
  9. American War of Independence
  10. Sir John Hawkins (1532-95)
  11. Moon Walk
  12. Early Stone Implements
  13. Conceptual image of DNA
  14. Tesla
  15. Colorized image of HIV-infected H9 T-cell
  16. William II, Prince of Orange, and his Bride, Mary Stuart, 1641
  17. Molecule Water
  18. Smilodon sabertooth mother and her cubs
  19. The Planet Mars
  20. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  21. Moon Chart I
  22. Bright Periodic Table - Black, Modern Text
  23. Prohibition Cartoon, 1920s
  24. Vintage Parchment Pencil Sharpener Patent Poster
  25. Yankee Doodle 1776
  26. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  27. Vintage Civil War print of Abraham Lincoln riding on horseback as a crowd cheers
  28. Solar System - Blue I
  29. Moses and the Burning Bush
  30. Vintage Civil War print featuring the Battle of Gettysburg
  31. USA Typography map
  32. George Washington taking command of the Army, 1775
  33. Desk Tools IV
  34. Grey School Chalkboard With Many Different Formulas And Signs
  35. Vintage Parchment Ophthalmoscope Patent
  36. Cyclopes
  37. Portrait of Andrew Jackson
  38. British Invasion
  39. Faded Blueprint Stethoscope Patent Poster
  40. Vintage Civil War print of President Abraham Lincoln and his cabinet
  41. Map Of the Battle Of Gettysburg, 1863
  42. Vitruvian Skeleton
  43. Illustration By Arthur Rackham From Grimm's Fairy Tale, The Cunning Little Tailor
  44. General Ulysses S. Grant leading Union troops into battle
  45. Miss Nightingale in the Hospital at Scutari
  46. Teaching is My Super Power
  47. James Monroe, by Gilbert Stuart, 1817
  48. Front page of The New York Times, 13 February 1945, reporting on the Yalta Conference