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  1. Pile of paperback books on desk in school library.
  2. Oregon. Close-up of Graveyard Point Plume Agate stone
  3. Scanning electron micrograph of HIV particles infecting a human T cell
  4. Conceptual image of DNA
  5. Malachite
  6. E=mc2 in red
  7. Vintage Civil War poster of the Battle of Missionary Ridge
  8. The Nine Year Siege of Troy
  9. Columbus, Map, 15th Century
  10. Object ABC
  11. Keyboard Keys
  12. Tribute To Vikings
  13. Be Creative
  14. Stock Exchange Image Magazine Page
  15. Classroom, Derby, 1985
  16. Conceptual image of DNA
  17. European Travel
  18. Close Ups Of Fortification On Crazy Lace Agate
  19. Civil War, Atlanta, c1863
  20. Wind turbine in rural location with old barn in Cavalier County, USA
  21. Denver, Colorado, 1859
  22. The Summer Road
  23. Young boy in school writing on chalkboard
  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. Paisley Agate
  30. Bouncing ball
  31. Conceptual image of platelets with red blood cells
  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. Diphtheria treatment, artwork
  40. Oklahoma - USGS State Mosaic
  41. Fortifications in front of Atlanta, Georgia, during the American Civil War
  42. Illustration showing the various parts that make up the sun
  43. Scanning electron micrograph of an apoptotic HeLa cell
  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 Emigrants Illustration From The Charles Dickens Novel David Copperfield
  47. The four terrestrial planets compared in scale
  48. Oregon. Close-up of Owyhee Picture Jasper stone