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