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  1. The Titanic's propeller in the Thompson Graving Dock of Harland
  2. Marco Polo
  3. Vice President Joseph Biden
  4. Page Proof From Great Expectations, Charles Dickens's Hand Written Corrections, 1812
  5. USA, Philadelphia, Benjamin Franklin statue at Franklin Institute
  6. Dublin, entrance gates to Marsh's Library, Ireland
  7. Heart and lung anatomy, 17th century
  8. Vintage presidential election poster
  9. American Negro Exposition
  10. Ferry boat altered to gunboat during the American Civil War
  11. Construction On Boston Common
  12. Bust of Socrates
  13. World Map, 500 BC
  14. Antietam, Maryland, 1862
  15. A Five Year Old Paperboy Selling Newspapers On The Street In St. Louis Missouri In 1910
  16. Benjamin Franklin, copy of 1777 painting by Jean-Baptiste Greuze
  17. Woman standing at long row of bobbins, at a textile factory, Millville, NJ, 1936
  18. The Battle of Cannae in 216 BC
  19. Legend of Archimedes and the lever
  20. George Washington taking command of the Army, 1775
  21. Pacific Coast Stock Exchange
  22. George Washington Carver (1864-1943)
  23. Dominican Republic, La Romana, Altos de Chavon, village detail
  24. The Battle of Bosworth - Into Battle
  25. Barack Obama (1961- )
  26. Former Prime Minister Winston Churchill opening General Election campaign at Leeds
  27. Thurgood Marshall
  28. Louis Pasteur, French microbiologist
  29. Berlin Wall
  30. The Making of America: 'Hear Me, My Chiefs'
  31. Willard Hotel, Washington, D.C
  32. Battle Of Mobile Bay, 1864
  33. Pantometer, 16th Century
  34. Mohandas Karamchand Gandhi, later known as Mahatma Gandhi, c. 1900 at age 30
  35. Shelley Lee Hamlin burst onto the golf scene at age 17
  36. Presidential portrait of President George H.W. Bush
  37. New York Under The Blue Laws, 1895
  38. The American Civil War
  39. 14th century theological cosmography
  40. An early telephone
  41. 1151 Highlanders Resting at the Front, 1918
  42. A room full of women Card Punch Operators working on the 1940 census
  43. Capital Building, Washington, DC
  44. Vintage American History print of Alexander Hamilton sitting at his desk
  45. Relief depicting the union between Upper Egypt and Lower Egypt, Egypt
  46. The Memorial To The Murdered Jews Of Europe, Berlin, Germany
  47. Hughes' printing telegraph
  48. Engine Moving Through A Rail Yard