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