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  1. USA, Philadelphia, Benjamin Franklin statue at Franklin Institute
  2. Santa Fe, NM, Wagon Train
  3. Benjamin Franklin, copy of 1777 painting by Jean-Baptiste Greuze
  4. Heart and lung anatomy, 17th century
  5. Ferry boat altered to gunboat during the American Civil War
  6. Cold War era fallout shelter sign
  7. Dublin, entrance gates to Marsh's Library, Ireland
  8. Antietam, Maryland, 1862
  9. A Five Year Old Paperboy Selling Newspapers On The Street In St. Louis Missouri In 1910
  10. Dominican Republic, La Romana, Altos de Chavon, village detail
  11. 14th century theological cosmography
  12. Newgrange, County Meath, Leinster, Republic of Ireland, Europe
  13. Woman standing at long row of bobbins, at a textile factory, Millville, NJ, 1936
  14. Former Prime Minister Winston Churchill opening General Election campaign at Leeds
  15. Construction On Boston Common
  16. Legend of Archimedes and the lever
  17. Thurgood Marshall
  18. The Battle of Cannae in 216 BC
  19. View From Merchandiso Mart
  20. George Washington Carver (1864-1943)
  21. Bust of Socrates
  22. American Negro Exposition
  23. The American Civil War
  24. Mohandas Karamchand Gandhi, later known as Mahatma Gandhi, c. 1900 at age 30
  25. Berlin Wall
  26. Louis Pasteur, French microbiologist
  27. The Battle of Bosworth - Into Battle
  28. Pacific Coast Stock Exchange
  29. Battle Of Mobile Bay, 1864
  30. Presidential portrait of President George H.W. Bush
  31. Barack Obama (1961- )
  32. New York Under The Blue Laws, 1895
  33. The Making of America: 'Hear Me, My Chiefs'
  34. Marco Polo
  35. Willard Hotel, Washington, D.C
  36. Pantometer, 16th Century
  37. Shelley Lee Hamlin burst onto the golf scene at age 17
  38. The Prince of Wales Hotel,and Vimy Peak, Waterton Lakes National Park, Alberta
  39. Capital Building, Washington, DC
  40. French Poster, Nicholas II and President Loubet celebrate the Franco-Russian Alliance
  41. A room full of women Card Punch Operators working on the 1940 census
  42. 1151 Highlanders Resting at the Front, 1918
  43. Front page of The New York Times, 13 February 1945, reporting on the Yalta Conference
  44. British leaders leaving the Westminster Abby memorial service for David Lloyd George
  45. World War I, Map, c1918
  46. Monument to Columbus landing, Aguada, Bahia de Aguadilla Bay, Puerto Rico
  47. Relief depicting the union between Upper Egypt and Lower Egypt, Egypt
  48. Engine Moving Through A Rail Yard