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  1. Arthritis of the knee, X-ray
  2. William Edward Burghardt Du Bois, African-American Scholar And Civil Rights Activist
  3. Roman Roads
  4. Molecule Licorice
  5. Normal shoulder, X-ray
  6. Hello Calculator
  7. Wright Flyer sculpture at Wright Brothers National Memorial, North Carolina
  8. Stamp out Syphilis and Gonorrhea - WPA Poster
  9. RMS Titanic being moved out of drydock, March 6, 1912
  10. Wilson Dam, Flood Gates
  11. Garden Tulip - Botanical Illustration
  12. Dental X-ray
  13. Teacher's desk in classroom
  14. Portrait Of Rosa Parks, Civil Rights Leader
  15. The vertebral column
  16. Portrait of Samuel Adams (1722-1803)
  17. Diphtheria treatment, artwork
  18. Napoleon Bonaparte crossing Alps through Saint Bernard Pass
  19. Newsboy Ned Parfett announcing the sinking of the 'Titanic' on April 16, 1912
  20. Desk Tools IV
  21. Neptune
  22. Balance
  23. Joan of Arc Re-Captures City of Beaugency From the British
  24. Hampton Institute, 1899
  25. The Moon
  26. Modern Geode IV
  27. General Ulysses S. Grant leading Union troops into battle
  28. Bees - Vintage Educational Poster
  29. A diagram of the Milky Way, depicting its various named parts
  30. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  31. Sioux Dance, 1890
  32. Molecule Honey
  33. Paisley Agate
  34. Rib cage and heart, 3D CT scan
  35. Early Stone Implements
  36. Molecule Peppermint
  37. Vintage Civil War print of President Abraham Lincoln and his cabinet
  38. Christmas Jasper
  39. Gem Stones III
  40. The Last of the Spirits. Illustration for the novella A Christmas Carol
  41. Close-Up Of Fortification Laguna Agate
  42. Gem Stones I
  43. Columbus, Map, 15th Century
  44. The nerve supply of the trunk
  45. Washing Gold, Calaveras, California, 1853
  46. James Monroe, by Gilbert Stuart, 1817
  47. Portrait Of Ida B. Wells Barnett, 1893
  48. The Hare and the Frogs, La Fontaine's Fables, 1900