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