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  1. 19th Century internal combustion engine
  2. President Lyndon B. Johnson
  3. Ankh or key of life, First courtyard of Ramses II, Egypt, Luxor Temple
  4. First Atom Bomb Test Site
  5. Lavoisier equipment, 1787
  6. Vintage World War One poster featuring the Marine Corps Emblem
  7. Ida B. Wells, 1891
  8. Colin Powell (1937- )
  9. 16th century map of the British Isles
  10. Faridun's Sons Marry the Three Daughters of Sero. Shahnameh. The Book of Kings
  11. World War II poster of tanks rolling into battle and a locomotive in motion
  12. An Ioway Chief
  13. A Filthy Young Coal Miner After A Long Day Of Work In The Mines Of West Virginia
  14. Vintage Civil War poster of the Battle of Missionary Ridge
  15. Classiebawn Castle With Ben Bulben In The Distance, Mullaghmore, County Sligo, Ireland
  16. Michelle Obama (1964- )
  17. Asian man wearing samurai armor
  18. The First Public Reading of the Declaration of Independence
  19. Thomas Edison, US inventor
  20. Concrete Blocks At Jewish Holocaust Memorial; Berlin, Germany
  21. A Civil War Era Regiment Of Colored Troops
  22. A Royal Air Force Hawker Typhoon Mk IB At Tangmere During World War II
  23. George Washington with Flag, Philadelphia, Pennsylvania
  24. Columbus, Map, 15th Century
  25. Elvis Presley training with a bazooka while on maneuvers in Germany
  26. Homeric cosmogony
  27. Earl Blaik was football coach at the United States Military Academy from 1941 to 1958
  28. Barack Obama (1961- )
  29. Busy Train Station In Michigan
  30. Revolutionary War Painting Showing The Surrender Of British General John Burgoyne
  31. Title - Death Of Lincoln. Medium - Engraving Date- 1875
  32. Hubert Julian was the only licensed Black aviator in America
  33. Manuscript Of Fifteenth Amendment To The Constitution
  34. Willard Hotel, Washington, D.C
  35. Stock Exchange Image Magazine Page
  36. Construction Of The Library Of Congress Photos May 4, 1892
  37. The Acropolis, Athens, Greece, Europe
  38. Civil War, Atlanta, c1863
  39. Angela Davis (1944- )
  40. Distillation, 16th century woodcut
  41. Anti Child Labor Poster, 1913
  42. The Wonderful Story of Britain: The Boston Tea-Party
  43. Telephone switchboard operator, 1914
  44. Booker T. Washington (1856-1915)
  45. The Battle Of Britain
  46. Bulguksa Temple, Unesco World Heritage Site, Gyeongju, South Korea
  47. Legend of Archimedes and the lever
  48. Panning for gold