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  1. Standard electrical circuit symbols
  2. Spine anatomy
  3. Durer's Rhinoceros, 1515
  4. Sherlock Holmes and Dr. Watson
  5. Rorschach Inkblot Test
  6. Butterflies, artwork
  7. Foot anatomy by Leonardo da Vinci
  8. Development of the English alphabet
  9. Spine anatomy
  10. Flame emission spectra of alkali metals
  11. Rhazes, Islamic scholar
  12. Newton's optics
  13. Table comparing ancient scripts
  14. Hummingbirds, historical artwork
  15. Olive trees, Puglia, Italy, Europe
  16. Newspaper printing press
  17. Early electrical equipment
  18. Computer hard disk assembly
  19. Body musculature
  20. Bees
  21. 16th century map of Venice
  22. 19th century chart of ocean currents
  23. Body musculature
  24. Egyptian and Assyrian counting systems
  25. Egyptian creation myth
  26. Phrenology chart
  27. Francesco Sforza, military leader
  28. Young hare, by Durer
  29. Nicolaus Copernicus, Polish astronomer
  30. Iron pyrites
  31. Early electric lamps
  32. Muscles of the side and back
  33. Anglo-Saxon 10th century world map
  34. Native American census roll, artwork
  35. Facial nerves
  36. Golden eagle, historical artwork
  37. Foot bones
  38. Features of fingerprints
  39. Shelduck, historical artwork
  40. Redshank, historical artwork
  41. Sandpiper, historical artwork
  42. Four Horsemen of the Apocalypse
  43. Apollonius of Perga, Greek mathematician
  44. Durer's Celestial Globe, 1515
  45. Brain anatomy, 16th century diagram
  46. Johannes Kepler and Tycho Brahe
  47. Torso bones
  48. 1920s television system, diagram