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  1. Tesla
  2. Pair of human hands on black background.
  3. Moon Chart I
  4. Indigo Agate D
  5. Sioux Grass Dance, c1913
  6. William II, Prince of Orange, and his Bride, Mary Stuart, 1641
  7. Prohibition Cartoon, 1920s
  8. Blood clot, SEM
  9. Black Hole Singularity Diagram
  10. Bright Periodic Table - Black, Modern Text
  11. Florida - USGS State Mosaic
  12. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  13. Vintage Civil War print of Abraham Lincoln riding on horseback as a crowd cheers
  14. Elastic artery cross-section, SEM
  15. Military camp with soldiers in street during the American Civil War
  16. Moses and the Burning Bush
  17. Algerian Sahara - USGS Earth as Art
  18. Vintage Civil War print featuring the Battle of Gettysburg
  19. Solar System - Blue I
  20. The cervical vertebrae
  21. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  22. Yankee Doodle 1776
  23. British Invasion
  24. Grey School Chalkboard With Many Different Formulas And Signs
  25. The vertebral column
  26. USA Typography map
  27. George Washington taking command of the Army, 1775
  28. Desk Tools IV
  29. Portrait of Andrew Jackson
  30. Cyclopes
  31. Portrait Of Harriet Tubman, 1868-69
  32. Vintage Civil War print of President Abraham Lincoln and his cabinet
  33. Moss Agate
  34. California, Palm Springs. Windmill Farm along North Indian Canyon Drive
  35. Newsboy Ned Parfett announcing the sinking of the 'Titanic' on April 16, 1912
  36. Vintage Parchment Ophthalmoscope Patent
  37. Vitruvian Skeleton
  38. General Ulysses S. Grant leading Union troops into battle
  39. Illustration By Arthur Rackham From Grimm's Fairy Tale, The Cunning Little Tailor
  40. Map Of the Battle Of Gettysburg, 1863
  41. A composite showing different stages of the 2010 solstice total moon eclipse
  42. Karman Vortices - USGS Earth as Art
  43. If I Were A Cloud
  44. Vintage Civil War print of General William Tecumseh Sherman
  45. Faded Blueprint Stethoscope Patent Poster
  46. Kentucky - USGS State Mosaic
  47. Lena Delta - USGS Earth as Art
  48. Teaching is My Super Power