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  1. Entropy
  2. Constitution Document
  3. Sioux Chief Sitting Bull
  4. String Theory
  5. Constitution Document - Articles 1-7
  6. Declaration Of Independence
  7. Quantum Mechanics
  8. Declaration Of Independence
  9. United States Constitution
  10. Habitable Zone
  11. Universal Gravitation
  12. Rosie The Riveter vintage war poster from World War II
  13. Herb Chart on Black
  14. Sitting Bull, a Hunkpapa Lakota tribal chief
  15. Strings II
  16. Native American Warrior
  17. Napoleon Bonaparte at the Royal Military School of Brienne
  18. Electromagnetic Induction
  19. Portrait of Abraham Lincoln
  20. Altering Current
  21. White Wolf, a Comanche Chief, c.1891-98
  22. Declaration of Independence _Khaki
  23. The Entrance of Joan of Arc into Orleans on 8th May 1429
  24. Declaration Of Independence
  25. Laws of Motion I
  26. George Washington By Gilbert Stuart
  27. Strings
  28. Laws of Motion II
  29. Laws of Motion III
  30. Electromagnetic Radiation
  31. George Washington, by Rembrandt Peale, c. 1850
  32. The Fox and the Crow, illustration from Aesop's Fables
  33. Electromagnetism
  34. Gravity
  35. Grain
  36. Fibonacci spiral, artwork
  37. Dandelion - Botanical Illustration
  38. 1938 Character Culture Citizenship Guide Poster, Read Good Books
  39. Viking longboats
  40. Emperor Napoleon in His Study at the Tuileries, by Jacques-Louis David, 1812
  41. Notorious RBG
  42. Prohibition Headline, 1919
  43. Strong Force
  44. Prague Astronomical Clock
  45. Explorers Wanted on the Journey to Mars
  46. Solar System - Old
  47. Bruce McCandless floating free from spacecraft in orbit, 1984
  48. Anterior view of human skeletal system, with labels