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  1. President John Kennedy takes the oath of office
  2. Tribute in Light Memorial illuminates a passing cloud above lower Manhattan
  3. Roy Campanella, catcher for the Brooklyn Dodgers, holding six bats, June 4, 1953
  4. The Memorial To The Murdered Jews Of Europe, Berlin, Germany
  5. Knight's armor
  6. Barbara McClintock, in her laboratory at Cold Spring Harbor, New York, in 1947
  7. The History of Our Wonderful World: The Vikings
  8. Camera man Don Clark and Director James Tinling film a scene for 'Change of Heart'
  9. View from Gaia of replica Viking ship Oseberg, Chesapeake Bay, USA
  10. Samuel Langhorne Clemens, 1835
  11. Washington's Entry Into New York On The Evacuation Of The City By The British In 1783
  12. Steamship Poster, 1873
  13. Taking Off..., illustration from 'Wings Across the World', 1978
  14. Vintage presidential election poster
  15. Statue of James Madison, Library of Congress, USA
  16. Heart anatomy, 18th century
  17. First Moon Men, Conceptual Art
  18. Former Beatle George Harrison (left) and Indian musician Ravi Shankar
  19. Murals, Teotihuacan, Mexico
  20. Ferry boat altered to gunboat during the American Civil War
  21. Dominican Republic, La Romana, Altos de Chavon, village detail
  22. Fortifications in front of Atlanta, Georgia, during the American Civil War
  23. Mahatma Gandhi, traveling to the 1931 Round Table Conference in London
  24. Diphtheria treatment, artwork
  25. The Pirates of Penzance
  26. Donati's Comet of 1858, artwork
  27. View Of Danzig, Poland From River, 1939
  28. A Human Formation Of The Liberty Bell At Camp Dix, New Jersey, 1918, World War I
  29. Abraham Lincoln, 1809
  30. Vintage American History print of Alexander Hamilton sitting at his desk
  31. The night raid on Coventry by German bombers during World War II
  32. Prison cells, Alcatraz Island, San Francisco, California
  33. Phonetic Egyptian hieroglyphs
  34. The Inauguration Of First President Of The United States In 1789, New York
  35. The Old State House, Financial District, Boston, Massachusetts, USA
  36. Barack Obama (1961- )
  37. Soldiers at camp during the American Civil War
  38. Sojourner Truth (c1797-1883)
  39. WWII Flying Tigers
  40. Roman Baths
  41. Instruments for removing bladder stones
  42. House Chambers In The U. S. Capitol
  43. Winston Churchill Sketches Magazine Page
  44. Cold War medical training, 1958
  45. World War I War Bonds poster, 1917
  46. Barack Obama (1961- )
  47. The Trojan Horse At Our Gate, Sept. 17, 1935
  48. World War II poster showing the silhouette of a soldier with his finger to his lips