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  1. Safety Pin Patent
  2. Statue of Urania, Muse of Astronomy, Vatican Museums
  3. World War I poster of a Navy patrol boat in the sea and a plane shining a spotlight
  4. The seafront and the Port of Split.
  5. Distillation apparatus, 18th century
  6. Lion and Gladiator
  7. Johann Gutenberg, German inventor
  8. Mount Vernon Mansion
  9. Bill Tilden, at the opening of the U.S. Pro Tennis Championship Tournament
  10. Mesolithic cave art
  11. Hannibal and his elephants crossing a river by raft
  12. Africa, 16th century Spanish map
  13. Aerial photo of Capitol Hill, May 1, 1932, with a view of the US Capitol and vicinity
  14. Print of folk hero and frontiersman Davy Crockett
  15. Armillary sphere, 18th Century artwork
  16. Piers By Brooklyn Bridge, New York
  17. Qala'at ibn Maan castle seen through monumental arch, Palmyra, Syria
  18. American history painting of Civil War General William Sherman
  19. Chamber Cranes In Pedro Miguel Locks
  20. Alberta, Reserve, c1890
  21. Ambassador George Bush
  22. The Renaissance
  23. On his rocker, instead of off, is Groucho Marx posing as Whistler's Mother
  24. Military camp with soldiers in street during the American Civil War
  25. The Pyramids, Giza, with Cairo beyond, Egypt, North Africa
  26. Relief depiction of Ramses II, Temple of Luxor, Egypt
  27. Maps of Barbary coast, Gulf of Tunis, and Nile River delta
  28. Statue of Marcellus
  29. Dublin, entrance gates to Marsh's Library, Ireland
  30. Convair F102A Aircraft
  31. Triger's caisson, 19th century
  32. Factory Damaged In The Johnstown Flood
  33. A Tent On A Bluff Over Shoshone Falls
  34. The Los Angeles Times announcing the end of World War I, 1918
  35. Front View Of The Ferry Building., San. Francisco, Cal. C1905
  36. Laocoon group, Vatican Museums
  37. B-29 Flying Over Japan's Countryside
  38. Ensisheim meteor fall, 1492
  39. American history painting of President William Henry Harrison
  40. Gold Pocket Watch Resting On A Book
  41. La Guardia Airport control tower, constructed in 1962
  42. Vintage World War I poster featuring two soldiers
  43. Nelson Mandela
  44. Irgal Gate, Nineveh, Iraq, Middle East
  45. Charles Rolls Taking Off For Non Stop Double Crossing Of The English Channel
  46. Violin, 17th century artwork
  47. Portrait of naturalist and geologist Charles Darwin
  48. Jonathan Hulls' steamboat, 18th century