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  1. Laguna Agate
  2. Spanish Conquistadors
  3. Normal neck, X-ray
  4. Vintage Civil War print of the Battle of Cold Harbor
  5. Abraham Lincoln and Stephen A. Douglas debating at Charleston, Illinois
  6. Signature of George Washington
  7. Diesel Motor
  8. John Adams, by Gilbert Stuart, c. 1800-15
  9. Curtis, Crow Men, c1905
  10. Close Ups Of Fortification On Crazy Lace Agate
  11. Jet Engine
  12. Benjamin Franklin, 1782
  13. Martin Luther King, Jr
  14. Herb Chart
  15. Tiny Engineers Fixing a Broken Chip on a Motherboard
  16. Library bookshelves
  17. Pencils
  18. Vintage World War II poster featuring a male lion
  19. Samurai
  20. French Counter-Attack at Village of Vaux near Verdun, 1916
  21. Modern Geode I
  22. Flowering Plum Orchard (After Hiroshige), 1887
  23. Apache Tepees, c1909
  24. Theodore Roosevelt in Office
  25. The Country School
  26. We Need You
  27. 'The Tyger', Plate 36 From 'Songs Of Innocence And Of Experience'
  28. Ancient Egyptian Art
  29. Brain, artwork
  30. Calculator
  31. The Trenches
  32. Moon Chart II
  33. Typical Animal Cell and Plant Cell
  34. The Presidents Educational Poster, 2013
  35. Gas Station, Wild West Painting Series
  36. Bolivia, Potosi, Amethyst in a Bolivian museum
  37. The Fishers of Men
  38. World War I, Map, 1918
  39. In A Stampede
  40. Civil War print depicting the Union Army's capture of Fort Fisher
  41. American Jazz Saxophone Player John Coltrane, 1957
  42. Agate Studies II
  43. Civil War print showing the Naval Battle of the Monitor and The Merrimack
  44. Grey Agate B
  45. Genius Handlettering
  46. Civil War print of General Lee surrendering his Confederate forces to General Grant
  47. The bones of the trunk
  48. Brain, artwork