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  1. Laguna Agate
  2. Spanish Conquistadors
  3. Abraham Lincoln and Stephen A. Douglas debating at Charleston, Illinois
  4. Normal neck, X-ray
  5. Vintage Civil War print of the Battle of Cold Harbor
  6. Signature of George Washington
  7. Diesel Motor
  8. John Adams, by Gilbert Stuart, c. 1800-15
  9. Jet Engine
  10. Close Ups Of Fortification On Crazy Lace Agate
  11. Curtis, Crow Men, c1905
  12. Benjamin Franklin, 1782
  13. Martin Luther King, Jr
  14. Herb Chart
  15. Tiny Engineers Fixing a Broken Chip on a Motherboard
  16. Samurai
  17. Library bookshelves
  18. Pencils
  19. Flowering Plum Orchard (After Hiroshige), 1887
  20. Vintage World War II poster featuring a male lion
  21. French Counter-Attack at Village of Vaux near Verdun, 1916
  22. Apache Tepees, c1909
  23. Modern Geode I
  24. Theodore Roosevelt in Office
  25. The Country School
  26. We Need You
  27. Calculator
  28. Ancient Egyptian Art
  29. 'The Tyger', Plate 36 From 'Songs Of Innocence And Of Experience'
  30. Brain, artwork
  31. The Trenches
  32. Moon Chart II
  33. Typical Animal Cell and Plant Cell
  34. American Jazz Saxophone Player John Coltrane, 1957
  35. The Presidents Educational Poster, 2013
  36. Bolivia, Potosi, Amethyst in a Bolivian museum
  37. World War I, Map, 1918
  38. The Fishers of Men
  39. Gas Station, Wild West Painting Series
  40. Civil War print showing the Naval Battle of the Monitor and The Merrimack
  41. Civil War print depicting the Union Army's capture of Fort Fisher
  42. Agate Studies II
  43. Grey Agate B
  44. The bones of the trunk
  45. Civil War print of General Lee surrendering his Confederate forces to General Grant
  46. Genius Handlettering
  47. Portrait Of Harriet Tubman, 1870
  48. Brain, artwork