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  1. The bones of the jaw
  2. Bullfrog
  3. Vintage Civil War print of President Abraham Lincoln and his cabinet
  4. Balance
  5. Edwin Hubble's Galaxy Classification System
  6. Relaxing feet.
  7. Women's Rights Parade, 1913
  8. Civil War print depicting the Union Army's capture of Fort Fisher
  9. Muhammad Ali on the shore of the Congo River, Kinshasa, Zaire
  10. Sir John Hawkins (1532-95)
  11. Young boy in school writing on chalkboard
  12. Vintage Civil War print of the Battle of Fredericksburg
  13. College Graduation Ceremony
  14. Listen to your Teacher
  15. Blood clot, SEM
  16. Washing Gold, Calaveras, California, 1853
  17. Ocean Jasper
  18. Human anatomy showing deep muscles in the neck and upper back
  19. Distance of Sun, Moon and Planets
  20. Bouncing ball
  21. Normal shoulder, X-ray
  22. Artist's Rendering Of A Solar System
  23. Alberta, Reserve, c1890
  24. Microscopic view of bacteria
  25. Capitol From the Botanical Gardens
  26. Signature of John Hancock
  27. The sun sets behind a row of spinning windmills or wind turbines
  28. Denver, Colorado, 1859
  29. Solar System II
  30. Pair of human hands on black background.
  31. Mathematical Elements IV
  32. Bright Periodic Table - White, Classic Text
  33. Normal shoulder, X-ray
  34. Portrait Of Rosa Parks, Civil Rights Leader
  35. Teacher's desk in classroom
  36. RMS Titanic being moved out of drydock, March 6, 1912
  37. Replica Of Eli Whitney's Cotton Gin
  38. Diphtheria treatment, artwork
  39. Newsboy Ned Parfett announcing the sinking of the 'Titanic' on April 16, 1912
  40. Hampton Institute, 1899
  41. Joan of Arc Re-Captures City of Beaugency From the British
  42. Close-Up Of Fortification Laguna Agate
  43. Christmas Jasper
  44. Sioux Dance, 1890
  45. Vintage Civil War print of President Abraham Lincoln and his cabinet
  46. Kentucky - USGS State Mosaic
  47. Columbus, Map, 15th Century
  48. Prohibition Cartoon, 1920s