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