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  1. Linguistics table, 17th century
  2. Terracotta Army
  3. Bears
  4. The building of the Union Pacific Railroad
  5. Surveyors Wanted to Explore Mars and its Moons
  6. Vintage American History print of Colonel Theodore Roosevelt
  7. Male skeleton, computer artwork.
  8. Gold Leaf Agate
  9. Manners and Lessons, from 'Through the Looking Glass' by Lewis Carroll
  10. Apollo 13
  11. Human digestive system, with labels
  12. Annunciation to the Shepherds. Book of Hours of Leonor de la Vega. 1465-70
  13. Oregon. Close-up of Owyhee Picture Jasper stone
  14. Conceptual image of DNA
  15. The Man and the Alembic
  16. The night raid on Coventry by German bombers during World War II
  17. Variety Of Flasks
  18. Paris at Thermopylae
  19. George Washington taking command of the Army, 1775
  20. The Battle of Bosworth - Into Battle
  21. Map of Palestine, Palestina Antiqua
  22. Pipestone Quarry On the Coteau Des Prairies, 1836
  23. Vintage American History print of General George Washington at The Battle of Trenton
  24. Early Stone Implements
  25. Book Cover of 'Jeanne d'Arc'
  26. Portrait of Ulysses S. Grant (1822-85)
  27. Rear view of acupuncture model
  28. Distillation, 16th century woodcut
  29. The Fox and the Crow, Selected Fontaine's Fables
  30. Manuscript Of Fifteenth Amendment To The Constitution
  31. old-fashioned drawing compass
  32. Meandering Mississippi - USGS Earth as Art
  33. Every Child Deserves A Great School
  34. Sailors on deck of USS Mendota gun boat during American Civil War
  35. Idaho - USGS State Mosaic
  36. Muscular man running
  37. The sun sets behind a row of spinning windmills or wind turbines
  38. Deforestation
  39. Portrait Of Rosa Parks, Civil Rights Leader
  40. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  41. California - USGS State Mosaic
  42. Scanning electron micrograph of an apoptotic HeLa cell
  43. Alice and the White Knight, from 'Alice in Wonderland' by Lewis Carroll
  44. Conceptual image of DNA
  45. Marley's Ghost. Illustration for the novella A Christmas Carol
  46. Human bones
  47. Fountain Pen
  48. Printing Press