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  1. World War I War Bonds poster, 1917
  2. World War II poster showing the silhouette of a soldier with his finger to his lips
  3. Knocking-off time at the Harland
  4. George Washington Carver
  5. Water mill and pump, 18th century
  6. Fun Facts about the U.S. Presidents
  7. Dennis Banks
  8. American Red Cross Serves Humanity Join!
  9. Aden From The Air
  10. George Washington Carver (c1864-1943)
  11. Chamber Cranes In Pedro Miguel Locks
  12. Facade Of The Los Angeles Stock Exchange
  13. Plans For The Maryland State House
  14. Marco Polo
  15. Covered wagon at Scotts Bluff National Monument, Nebraska
  16. 19th Century internal combustion engine
  17. French Writer Albert Camus (1913-1960) At Home June 13, 1947
  18. Harold Lloyd
  19. Niels Bohr, James Franck, Albert Einstein, and Isidor Rabi
  20. Elijah Muhammad (1897-1975)
  21. LiquidLibrary
  22. Queen Mary of England by Antonio Moro
  23. Neptune fountain at Navona square, Rome
  24. Madame C.J. Walker (1867-1919)
  25. Charles Haddon Spurgeon (1834-92) engraved by D.J. Pound from a photograph
  26. Victorian or Edwardian Beach Scene
  27. Camel riders at Giza Pyramids, Giza, Cairo, Egypt, Africa
  28. Japanese Samurai Blade
  29. World War I poster of a Navy patrol boat in the sea and a plane shining a spotlight
  30. Table from Becher's 'Opuscula chymica'
  31. German WWII ramjet bomber blueprint
  32. Mylius' Philosophia reformata
  33. World Trade Center Ground Zero site under reconstruction Sept 8, 2011
  34. May Day, 1907
  35. Early American steam locomotive
  36. A Prehistoric Mammoth Hunt
  37. Bust of Socrates
  38. German astronomy atlas, 1882
  39. The Krak des Chevaliers, Crusader castle, Syria, Middle East
  40. Pascal's calculator, 17th Century artwork
  41. Silversmith at work, c.1914
  42. Department Of Justice Building In Washington D. C
  43. Civil War Poster Seeking Vermont 9Th Infantry Recruits
  44. Newgrange, County Meath, Leinster, Republic of Ireland, Europe
  45. Check Up
  46. Edison talking into his phonograph
  47. Crusader
  48. Woman standing at long row of bobbins, at a textile factory, Millville, NJ, 1936