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  1. Pair of human hands on black background.
  2. Tesla
  3. Indigo Agate D
  4. Sioux Grass Dance, c1913
  5. William II, Prince of Orange, and his Bride, Mary Stuart, 1641
  6. Plan Of the Campaign In New York And New Jersey, 1776
  7. Blood clot, SEM
  8. A composite showing different stages of the 2010 solstice total moon eclipse
  9. Elastic artery cross-section, SEM
  10. Bright Periodic Table - Black, Modern Text
  11. Algerian Sahara - USGS Earth as Art
  12. Black Hole Singularity Diagram
  13. Florida - USGS State Mosaic
  14. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  15. Bees - Vintage Educational Poster
  16. Patent--Light Bulb
  17. Vintage Civil War print of Abraham Lincoln riding on horseback as a crowd cheers
  18. Denver, Colorado, 1859
  19. Yankee Doodle 1776
  20. George Washington taking command of the Army, 1775
  21. Military camp with soldiers in street during the American Civil War
  22. Vintage Civil War print featuring the Battle of Gettysburg
  23. Moses and the Burning Bush
  24. Conceptual image of DNA
  25. The cervical vertebrae
  26. Vintage Civil War print of President Abraham Lincoln and his cabinet
  27. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  28. The vertebral column
  29. Grey School Chalkboard With Many Different Formulas And Signs
  30. British Invasion
  31. Desk Tools IV
  32. Cyclopes
  33. Portrait of Andrew Jackson
  34. Portrait Of Harriet Tubman, 1868-69
  35. Moss Agate
  36. California, Palm Springs. Windmill Farm along North Indian Canyon Drive
  37. Solar System II
  38. Newsboy Ned Parfett announcing the sinking of the 'Titanic' on April 16, 1912
  39. Vitruvian Skeleton
  40. Map Of the Battle Of Gettysburg, 1863
  41. Vintage Parchment Ophthalmoscope Patent
  42. Illustration By Arthur Rackham From Grimm's Fairy Tale, The Cunning Little Tailor
  43. General Ulysses S. Grant leading Union troops into battle
  44. Kentucky - USGS State Mosaic
  45. Colorized image of HIV-infected H9 T-cell
  46. Vintage Civil War print of General William Tecumseh Sherman
  47. Lena Delta - USGS Earth as Art
  48. Fountain Pen