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  1. Purple Watercolor Agate I
  2. Indigo Agate D
  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. Florida - USGS State Mosaic
  8. Vintage Parchment Pencil Sharpener Patent Poster
  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. Military camp with soldiers in street during the American Civil War
  13. Vintage Civil War print of Abraham Lincoln riding on horseback as a crowd cheers
  14. Elastic artery cross-section, SEM
  15. Algerian Sahara - USGS Earth as Art
  16. Moses and the Burning Bush
  17. Vintage Civil War print featuring the Battle of Gettysburg
  18. Solar System - Blue I
  19. The cervical vertebrae
  20. Yankee Doodle 1776
  21. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  22. The vertebral column
  23. Grey School Chalkboard With Many Different Formulas And Signs
  24. British Invasion
  25. USA Typography map
  26. Desk Tools IV
  27. George Washington taking command of the Army, 1775
  28. Portrait of Andrew Jackson
  29. Vintage Parchment Ophthalmoscope Patent
  30. Cyclopes
  31. California, Palm Springs. Windmill Farm along North Indian Canyon Drive
  32. Portrait Of Harriet Tubman, 1868-69
  33. Vintage Civil War print of President Abraham Lincoln and his cabinet
  34. Moss Agate
  35. Newsboy Ned Parfett announcing the sinking of the 'Titanic' on April 16, 1912
  36. Map Of the Battle Of Gettysburg, 1863
  37. Illustration By Arthur Rackham From Grimm's Fairy Tale, The Cunning Little Tailor
  38. Vitruvian Skeleton
  39. Faded Blueprint Stethoscope Patent Poster
  40. General Ulysses S. Grant leading Union troops into battle
  41. Karman Vortices - USGS Earth as Art
  42. A composite showing different stages of the 2010 solstice total moon eclipse
  43. If I Were A Cloud
  44. Miss Nightingale in the Hospital at Scutari
  45. Kentucky - USGS State Mosaic
  46. Lena Delta - USGS Earth as Art
  47. Sailors on deck of USS Mendota gun boat during American Civil War
  48. Wingate Pass Agate, Ca