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