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  1. Arthritis of the knee, X-ray
  2. Indigo Agate D
  3. The vertebral column
  4. Roman Roads
  5. Bright Periodic Table - White, Classic Text
  6. Stamp out Syphilis and Gonorrhea - WPA Poster
  7. Normal shoulder, X-ray
  8. Wright Flyer sculpture at Wright Brothers National Memorial, North Carolina
  9. Dental X-ray
  10. Portrait Of Rosa Parks, Civil Rights Leader
  11. Napoleon Bonaparte crossing Alps through Saint Bernard Pass
  12. RMS Titanic being moved out of drydock, March 6, 1912
  13. Teacher's desk in classroom
  14. Neptune
  15. General Ulysses S. Grant leading Union troops into battle
  16. Replica Of Eli Whitney's Cotton Gin
  17. William Edward Burghardt Du Bois, African-American Scholar And Civil Rights Activist
  18. Diphtheria treatment, artwork
  19. Newsboy Ned Parfett announcing the sinking of the 'Titanic' on April 16, 1912
  20. Molecule Peppermint
  21. Hampton Institute, 1899
  22. Desk Tools IV
  23. Portrait of Samuel Adams (1722-1803)
  24. Joan of Arc Re-Captures City of Beaugency From the British
  25. Close-Up Of Fortification Laguna Agate
  26. A diagram of the Milky Way, depicting its various named parts
  27. Christmas Jasper
  28. Molecule Honey
  29. The Hare and the Frogs, La Fontaine's Fables, 1900
  30. Early Stone Implements
  31. The Last of the Spirits. Illustration for the novella A Christmas Carol
  32. Sioux Dance, 1890
  33. Rib cage and heart, 3D CT scan
  34. Vintage Civil War print of President Abraham Lincoln and his cabinet
  35. Conversion
  36. James Monroe, by Gilbert Stuart, 1817
  37. Kentucky - USGS State Mosaic
  38. Pathways Educational Poster
  39. Caduceus and graph
  40. Garden Tulip - Botanical Illustration
  41. Molecule Milk
  42. Gem Stones I
  43. Marley's Ghost. Illustration for the novella A Christmas Carol
  44. Arkansas - USGS State Mosaic
  45. Columbus, Map, 15th Century
  46. Plan Of the Campaign In New York And New Jersey, 1776
  47. Prohibition Cartoon, 1920s
  48. Mars