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  1. The First Public Reading of the Declaration of Independence
  2. Oregon. Close-up of Graveyard Point Plume Agate stone
  3. Conceptual image of DNA
  4. Scanning electron micrograph of HIV particles infecting a human T cell
  5. E=mc2 in red
  6. Malachite
  7. Vintage Civil War poster of the Battle of Missionary Ridge
  8. The Nine Year Siege of Troy
  9. Sailors on deck of USS Mendota gun boat during American Civil War
  10. Columbus, Map, 15th Century
  11. Object ABC
  12. Keyboard Keys
  13. Be Creative
  14. Stock Exchange Image Magazine Page
  15. Classroom, Derby, 1985
  16. Close Ups Of Fortification On Crazy Lace Agate
  17. Conceptual image of DNA
  18. European Travel
  19. Civil War, Atlanta, c1863
  20. Wind turbine in rural location with old barn in Cavalier County, USA
  21. Denver, Colorado, 1859
  22. Young boy in school writing on chalkboard
  23. The Summer Road
  24. Blood cells in blood vessel, artwork
  25. Sagenite On Mexican Agate
  26. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  27. Vintage print of Presidents James Garfield, Abraham Lincoln, and William McKinley
  28. Capitol From the Botanical Gardens
  29. Conceptual image of platelets with red blood cells
  30. Paisley Agate
  31. Bouncing ball
  32. Map Of France, C.1900
  33. The Flying Dutchman And Voltigeur Running The Great Match At York Racecourse
  34. Washington's Entry Into New York On The Evacuation Of The City By The British In 1783
  35. Taking Off..., illustration from 'Wings Across the World', 1978
  36. Running On The Wind
  37. Christmas Jasper
  38. Ferry boat altered to gunboat during the American Civil War
  39. Fortifications in front of Atlanta, Georgia, during the American Civil War
  40. Diphtheria treatment, artwork
  41. Oklahoma - USGS State Mosaic
  42. Scanning electron micrograph of an apoptotic HeLa cell
  43. Illustration showing the various parts that make up the sun
  44. The Inauguration Of First President Of The United States In 1789, New York
  45. Soldiers at camp during the American Civil War
  46. The four terrestrial planets compared in scale
  47. The Emigrants Illustration From The Charles Dickens Novel David Copperfield
  48. Oregon. Close-up of Owyhee Picture Jasper stone