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