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