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  1. Ida B. Wells, 1891
  2. Caduceus and graph
  3. Development of Arabic numerals
  4. Conceptual image of DNA
  5. An Ioway Chief
  6. Scanning electron micrograph of HIV particles infecting a human T cell
  7. Malachite
  8. E=mc2 in red
  9. Battle Of Saratoga, 1777
  10. Desert to Forest - USGS Earth as Art
  11. The human body with superimposed colored plates by Julien Bougle
  12. Vintage Civil War poster of the Battle of Missionary Ridge
  13. Molecule Peppermint
  14. The Planet Uranus
  15. The Nine Year Siege of Troy
  16. Wilson Dam, Alabama, forms portion of the Tennessee River barge route
  17. Plan Of the Campaign In New York And New Jersey, 1776
  18. Conceptual image of human backbone
  19. Faridun's Sons Marry the Three Daughters of Sero. Shahnameh. The Book of Kings
  20. Columbus, Map, 15th Century
  21. P-38 Lightning Technical: Retro Travel Poster
  22. The nerve supply of the trunk
  23. The Planet Mercury
  24. Technicians Wanted to Engineer our Future on Mars
  25. Object ABC
  26. Manuscript Of Fifteenth Amendment To The Constitution
  27. Keyboard Keys
  28. Franklin
  29. Richat Structure - USGS Earth as Art
  30. Be Creative
  31. Born to be a Teacher
  32. Brain antomy, 19th century artwork
  33. Electronics Illustrated, March
  34. Molecule Chili
  35. The bones of the head, neck and face
  36. Stock Exchange Image Magazine Page
  37. Arthritis of the hip, X-ray
  38. Vintage Parchment Fleming Valve Patent Poster
  39. Base of human skull, inferior view, with labels
  40. Classroom, Derby, 1985
  41. Molecule Ethanol
  42. Alphabet For Children, 2002
  43. Tyrannosaurus
  44. Agate Geode I
  45. A Garland For May Day 1895 Dedicated To The Workers By Walter Crane
  46. Distillation, 16th century woodcut
  47. Anti Child Labor Poster, 1913
  48. Conceptual image of DNA