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  1. Marco Polo
  2. USA, Philadelphia, Benjamin Franklin statue at Franklin Institute
  3. Dublin, entrance gates to Marsh's Library, Ireland
  4. Heart and lung anatomy, 17th century
  5. Construction On Boston Common
  6. Ferry boat altered to gunboat during the American Civil War
  7. Bust of Socrates
  8. American Negro Exposition
  9. Benjamin Franklin, copy of 1777 painting by Jean-Baptiste Greuze
  10. Legend of Archimedes and the lever
  11. George Washington Carver (1864-1943)
  12. Barack Obama (1961- )
  13. Former Prime Minister Winston Churchill opening General Election campaign at Leeds
  14. Thurgood Marshall
  15. Willard Hotel, Washington, D.C
  16. Louis Pasteur, French microbiologist
  17. The Making of America: 'Hear Me, My Chiefs'
  18. Berlin Wall
  19. Mohandas Karamchand Gandhi, later known as Mahatma Gandhi, c. 1900 at age 30
  20. Grand Palace, Brussels, Belgium
  21. Presidential portrait of President George H.W. Bush
  22. An early telephone
  23. 14th century theological cosmography
  24. 1151 Highlanders Resting at the Front, 1918
  25. Capital Building, Washington, DC
  26. Relief depicting the union between Upper Egypt and Lower Egypt, Egypt
  27. Engine Moving Through A Rail Yard
  28. French Poster, Nicholas II and President Loubet celebrate the Franco-Russian Alliance
  29. Hughes' printing telegraph
  30. The Prince of Wales Hotel,and Vimy Peak, Waterton Lakes National Park, Alberta
  31. World War I poster of a U.S. airman cranking the propeller of an airplane
  32. Ortelius's map of Northern Europe, 1570
  33. Terracotta Warriors
  34. Helen Wills Moody warming up before her first round match
  35. Elijah Muhammad (1897-1975)
  36. People Playing Lawn Tennis
  37. Vintage World War One poster of a Red Cross nurse holding out her arms
  38. Frederick Douglass (c1817-1895)
  39. Booker T. Washington(1856-1915)
  40. Michelle Obama (1964- )
  41. Ortelius's map of European Russia, 1570
  42. Swords of France, Eagles of Napoleon, By Jacques de Breville, JOB
  43. George HW Bush, Vice President during the Ronald Reagan Administration
  44. Boring a hole
  45. George Washington Carver (1864-1943)
  46. Blue Whale Skeleton, Hintze Hall, Natural History Museum, London, England
  47. Terra Cotta Warrior of Xi'an, China
  48. Pascal's calculator, 17th Century artwork