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  1. Alcatraz Island and the San Francisco Bay and skyline of San Francisco, California, USA
  2. Samuel Langhorne Clemens, 1835
  3. Protozoa, historical artwork
  4. American history painting of President William Henry Harrison
  5. Madonna of the Prairie
  6. Chief Joseph Brant
  7. Ortelius's map of Austria, 1570
  8. General Philip Kearny's fatal charge at the Battle of Chantilly
  9. Library Of Congress Reading Room
  10. Zora Hurston Beating The Hountar (Mama Drum), 1937
  11. On his rocker, instead of off, is Groucho Marx posing as Whistler's Mother
  12. Paul Charles Morphy (1837-84) engraved by D.J. Pound from a photograph
  13. Obama And Mandela, 2011
  14. Civil War Poster Seeking Vermont 9Th Infantry Recruits
  15. Thomas Edison, US inventor
  16. Sailors on deck of USS Mendota gun boat during American Civil War
  17. Total solar eclipse, 1878
  18. Study for 'Light Battery at Gettysburg'
  19. Moon Walk
  20. Moses and the Burning Bush
  21. The Army that Fought at Sea
  22. You Can Help, American Red Cross, 1918
  23. Graham Hill, waves as his car streaks toward the finish line to win the Indianapolis 500
  24. Discovery Hind Leg Of The Dinosaur Diplodocus, By Henry Fairfield Osborn In 1898
  25. Knocking-off time at the Harland
  26. Maat, goddess of wisdom, justice and truth, Egypt, Luxor Temple
  27. German WWII ramjet bomber blueprint
  28. First Atom Bomb Test Site
  29. The History of Our Wonderful World: The Vikings
  30. Taverns And Wagons In Western American Town
  31. Relief depicting a pharaoh making an offering, Temple of Luxor, Egypt
  32. Sunwatch Indian
  33. Vintage World War II artwork of President Franklin Delano Roosevelt
  34. Laocoon group, Vatican Museums
  35. President John F. Kennedy visits with reporters
  36. View of Tangier from the Seashore, 1856-8
  37. View Of Danzig, Poland From River, 1939
  38. Camel riders at Giza Pyramids, Giza, Cairo, Egypt, Africa
  39. The Wonderful Story of Britain: The Boston Tea-Party
  40. Roy Campanella, catcher for the Brooklyn Dodgers, holding six bats, June 4, 1953
  41. Robert Emmet McGrath, as character Bob Johnson, on Sesame Street, 1970
  42. Distillation, 16th century woodcut
  43. Napoleonic Wars, Portrait of Haiti's leader, Toussaint L'ouverture, By Louis Bombled
  44. Beatus of Girona. 976. Sheet 6, depiction of Saint John the Evangelist
  45. President John F. Kennedy signing the Equal Pay Act
  46. World War II War Bonds poster, 1943
  47. Indian Motor Cycle Ambulance
  48. Check Up