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  1. Grey Agate E
  2. The Doctrine of Monroe
  3. Jet Engine
  4. United States Constitution - Vertical
  5. Hudson Bay Trading Post On Flathead Indian Reservation, Montana Territory, c1860
  6. Religious Book Week, Good Books Build Character
  7. Aquatic Collage
  8. Bolivia, Potosi, Amethyst in a Bolivian museum
  9. A diagram showing the phases of the Earths moon
  10. Brain, artwork
  11. Serotonin neurotransmitter molecule
  12. The Hare Afraid by His Ears, La Fontaine's Fables
  13. Emperor Napoleon in His Study at the Tuileries, by Jacques-Louis David, 1812
  14. Tiny Engineers Fixing a Broken Chip on a Motherboard
  15. Prohibition Headline, 1919
  16. Let Freedom Ring I
  17. Anterior view of human skeletal system, with labels
  18. Abraham Lincoln, by George Peter Alexander Healy, 1860
  19. Mathematical Elements I
  20. Explorers Wanted on the Journey to Mars
  21. Civil War print showing the Naval Battle of the Monitor and The Merrimack
  22. Solar System Educational Poster
  23. Civil War print of General Lee surrendering his Confederate forces to General Grant
  24. Hand doing math homework
  25. Typical Animal Cell and Plant Cell
  26. Bruce McCandless floating free from spacecraft in orbit, 1984
  27. Neutral Periodic Table
  28. John Adams, by Gilbert Stuart, c. 1800-15
  29. George Washington, by Gilbert Stuart, c. 1803-05
  30. Close Ups Of Fortification On Crazy Lace Agate
  31. The Titanic's propellers in the Thompson Graving Dock of Harland
  32. Interior of the Library, Trinity College, Dublin, Eire (Republic of Ireland)
  33. Notorious RBG
  34. Titanic ready for her maiden voyage, 02 April 1912
  35. Book
  36. Mathematical Elements IV
  37. Apache Men, c1903
  38. Malachite
  39. Let Freedom Ring II
  40. Colon blood vessels, light micrograph
  41. Spanish Conquistadors
  42. Math Formulas On Chalkboard
  43. Agate Studies III
  44. Brain, artwork
  45. Listen to your Teacher
  46. Timeline of Animals
  47. Shattuckite Jasper
  48. Vintage World War II poster featuring a male lion