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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. Declaration of Independence _Khaki
  10. White Wolf, a Comanche Chief, c.1891-98
  11. The Buffalo Hunt
  12. The Fox and the Crow, illustration from Aesop's Fables
  13. Pi to 2198 decimal places
  14. Cherry Creek Jasper
  15. Neutral Periodic Table
  16. Prague Astronomical Clock
  17. Chalkboard Periodic Table
  18. Sinking Of The Titanic By Willy Stoewer
  19. Pencils
  20. The Reading Room on board the Titanic, 1912
  21. World War II: Headline, 1941
  22. Abraham Lincoln, by George Peter Alexander Healy, 1860
  23. George Washington, by Gilbert Stuart, c. 1803-05
  24. Diesel Motor
  25. Curtis, Crow Men, c1905
  26. John Adams, by Gilbert Stuart, c. 1800-15
  27. Jet Engine
  28. Apache Tepees, c1909
  29. Ford Engine
  30. Calculator
  31. Lincoln's Gettysburg Address
  32. The Fishers of Men
  33. Genius Handlettering
  34. Bolivia, Potosi, Amethyst in a Bolivian museum
  35. Civil War print showing the Naval Battle of the Monitor and The Merrimack
  36. Vintage Civil War print of the Battle of Gettysburg
  37. Solar System - Minimal
  38. Benjamin Franklin's face on the Hundred Dollar Bill
  39. Let Freedom Ring I
  40. Light Bulb
  41. Earth Agate F
  42. Jupiter
  43. The Doctrine of Monroe
  44. A Prehistoric Mammoth Hunt
  45. Never Stop Learning
  46. Titanic ready for her maiden voyage, 02 April 1912
  47. Revolutionary War print showing the surrender of British troops
  48. Unidentified Viking scene with longship aflame