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  1. Entropy
  2. Solar System Background
  3. Bolts of electricity discharging in the lab of Nikola Tesla
  4. String Theory
  5. Tyrannosaurus Rex Study
  6. Signing the Declaration of Independence, 4th July 1776, c.1817
  7. Agate Studies I
  8. Painting of George Washington crossing the Delaware
  9. Sioux Chief Sitting Bull
  10. Constitution Document - Articles 1-7
  11. Quantum Mechanics
  12. Native American Chiefs
  13. Painting of George Washington crossing the Delaware
  14. The Titanic's propellers in the Thompson Graving Dock of Harland
  15. Declaration Of Independence
  16. Declaration Of Independence
  17. Bright Periodic Table - Navy, Modern Text
  18. Habitable Zone
  19. Solar System 1
  20. Universal Gravitation
  21. Antique Periodic Table - Classic Text
  22. Vintage Civil War print of the Battle of Gettysburg
  23. Sage Agate A
  24. Timeline of Dinosaurs
  25. Egyptian Papyrus
  26. Alice In Wonderland
  27. Rainbow Book
  28. Revolutionary War Painting showing the surrender of British General John Burgoyne
  29. The Resignation of George Washington on 23rd December 1783, c.1822
  30. Vintage Civil War print of the Battle of Gettysburg
  31. Zulu Warriors
  32. Portrait of Abraham Lincoln
  33. Timeline of Life on Earth
  34. Native American Warrior
  35. Laws of Motion I
  36. Ancient Egyptian Art
  37. Spinosaurus Study
  38. Civil War painting of Union and Confederate troops fighting at The Battle of Antietam
  39. Herb Chart on Black
  40. The onboard gym on the Titanic showing the rowing machines and exercise bikes, 1912
  41. Fortifications Crazy Lace Agate
  42. Rosie The Riveter vintage war poster from World War II
  43. Laws of Motion II
  44. Zulu Warrior
  45. Electromagnetic Induction
  46. Sitting Bull, a Hunkpapa Lakota tribal chief
  47. Laws of Motion III
  48. Mathematical Elements III