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