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  1. Bolts of electricity discharging in the lab of Nikola Tesla
  2. Sioux Chief Sitting Bull
  3. String Theory
  4. Vintage Civil War print of the Battle of Gettysburg
  5. Universal Gravitation
  6. 1940's Trading In Progress On Floor Of New York Stock Exchange NYC USA
  7. Zulu Warriors
  8. Strings II
  9. White Wolf, a Comanche Chief, c.1891-98
  10. Declaration of Independence _Khaki
  11. The Buffalo Hunt
  12. The Fox and the Crow, illustration from Aesop's Fables
  13. Neutral Periodic Table
  14. Cherry Creek Jasper
  15. Pi to 2198 decimal places
  16. Prague Astronomical Clock
  17. Chalkboard Periodic Table
  18. Abraham Lincoln, by George Peter Alexander Healy, 1860
  19. World War II: Headline, 1941
  20. George Washington, by Gilbert Stuart, c. 1803-05
  21. Sinking Of The Titanic By Willy Stoewer
  22. The Reading Room on board the Titanic, 1912
  23. John Adams, by Gilbert Stuart, c. 1800-15
  24. Diesel Motor
  25. Curtis, Crow Men, c1905
  26. Jet Engine
  27. Pencils
  28. Apache Tepees, c1909
  29. Calculator
  30. Civil War print showing the Naval Battle of the Monitor and The Merrimack
  31. Bolivia, Potosi, Amethyst in a Bolivian museum
  32. The Fishers of Men
  33. Genius Handlettering
  34. Vintage Civil War print of the Battle of Gettysburg
  35. Let Freedom Ring I
  36. Solar System - Minimal
  37. The Doctrine of Monroe
  38. Lincoln's Gettysburg Address
  39. Light Bulb
  40. Earth Agate F
  41. Ford Engine
  42. Benjamin Franklin's face on the Hundred Dollar Bill
  43. Civil War painting of Union and Confederate troops fighting at The Battle of Bull Run
  44. Jupiter
  45. A Prehistoric Mammoth Hunt
  46. Never Stop Learning
  47. Unidentified Viking scene with longship aflame
  48. Revolutionary War print showing the surrender of British troops