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  1. Condor Agate With Fortifcations
  2. A Is For Alligator
  3. Oilfield At Spindletop
  4. Neon Periodic Table
  5. Vintage Civil War print of the Battle of Cold Harbor
  6. Gravity
  7. The Capitol -East Front
  8. Underground Railroad Map
  9. Weak Force
  10. Davy Crockett: Hero of the Alamo
  11. Albert Einstein
  12. Spanish Conquistadors
  13. Benjamin Franklin's face on the Hundred Dollar Bill
  14. Sinking Of The Titanic
  15. Abraham Lincoln and Stephen A. Douglas debating at Charleston, Illinois
  16. Abe
  17. Einstein
  18. Eye Chart III
  19. Woodstock
  20. Four kinds of lamp: Edison, Maxim, Swan, and Werdermann
  21. Normal neck, X-ray
  22. Coral Reef
  23. The First Reading of the Emancipation Proclamation Before the Cabinet
  24. Mushroom Chart I
  25. Prohibition Headline, 1919
  26. John Dillinger Wanted Poster
  27. Portrait Of John Brown
  28. Curtis, Crow Men, c1905
  29. American Jazz Saxophone Player John Coltrane, 1957
  30. Washington Crossing The Delaware On The Evening Of Dec. 25th 1776
  31. Apache Tepees, c1909
  32. The Hare and the Tortoise, illustration from Aesop's Fables
  33. Obama: Change
  34. Martin Luther King, Jr
  35. The Tea Party
  36. Development of the English alphabet
  37. Multi-Life
  38. Winston Churchill
  39. Electric Coloured Sky
  40. Calculator
  41. Civil War print depicting the Union Army's capture of Fort Fisher
  42. Saturn
  43. World War II: Headline, 1941
  44. Moon Chart II
  45. 'The Tyger', Plate 36 From 'Songs Of Innocence And Of Experience'
  46. Old Brass', a native North American, 19th century
  47. Attorney And Client, Fortitude And Impatience. Illustration From The Book Bleak House
  48. Pharoahs of Egypt