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  1. Timeline of Animals
  2. Spanish Conquistadors
  3. Laguna Agate
  4. Abraham Lincoln and Stephen A. Douglas debating at Charleston, Illinois
  5. Obama: Change
  6. Signature of George Washington
  7. Vintage World War II poster featuring a male lion
  8. Love to Read
  9. Diesel Motor
  10. Curtis, Crow Men, c1905
  11. Jet Engine
  12. We Need You
  13. Martin Luther King, Jr
  14. French Counter-Attack at Village of Vaux near Verdun, 1916
  15. Close Ups Of Fortification On Crazy Lace Agate
  16. Tiny Engineers Fixing a Broken Chip on a Motherboard
  17. Flowering Plum Orchard (After Hiroshige), 1887
  18. Apache Tepees, c1909
  19. Modern Geode I
  20. Samurai
  21. Brain, artwork
  22. Pencils
  23. 'The Tyger', Plate 36 From 'Songs Of Innocence And Of Experience'
  24. The Country School
  25. Ancient Egyptian Art
  26. Herb Chart
  27. Calculator
  28. Library bookshelves
  29. World War I, Map, 1918
  30. Theodore Roosevelt in Office
  31. Typical Animal Cell and Plant Cell
  32. Vintage Civil War print of the Battle of Gettysburg
  33. Civil War print showing the Naval Battle of the Monitor and The Merrimack
  34. Civil War print depicting the Union Army's capture of Fort Fisher
  35. American Jazz Saxophone Player John Coltrane, 1957
  36. The Trenches
  37. John Adams, by Gilbert Stuart, c. 1800-15
  38. The Fishers of Men
  39. The Presidents Educational Poster, 2013
  40. Moon Chart II
  41. Bolivia, Potosi, Amethyst in a Bolivian museum
  42. Lincoln's Gettysburg Address
  43. The bones of the trunk
  44. Genius Handlettering
  45. Gas Station, Wild West Painting Series
  46. Paul Revere By John Singleton Copley
  47. Plum Agate B
  48. Rhodochrosite Mineral From China's Wuton Mine