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  1. Lumbar vertebra
  2. Alaska - USGS State Mosaic
  3. First Letter Carried By Pony Express
  4. Officers of 4th New Jersey Infantry, American Civil War
  5. Mark Twain , 1901
  6. Pylons in a rural landscape at dusk
  7. Yellowstone
  8. Women's Rights Parade, 1917
  9. Pearl Harbor
  10. Archaeopteryx
  11. Colours That Reflect Joy
  12. old-fashioned drawing compass
  13. Artillery park during the American Civil War
  14. The Man and the Alembic
  15. Washington Taking Command Of The American Army At Cambridge
  16. Cross section image of human head
  17. Conceptual image of DNA
  18. Dice on math game
  19. Antique French Grape Press
  20. American History print of Benjamin Franklin's reception by the French court
  21. Venus
  22. Blood clot, SEM
  23. Circulatory system and brain, artwork
  24. Science classroom
  25. Canada, Quebec. Honey Economusee. Beehive
  26. Nebraska - USGS State Mosaic
  27. To Polish The Sun
  28. Long Island Railroad Communication Lines
  29. Bright Periodic Table - Black, Classic Text
  30. Bright Periodic Table - Navy, Classic Text
  31. License Plate Periodic Table
  32. Washington - USGS State Mosaic
  33. The Tocsin Of Liberty Rung By The State House Bell, Philadelphia On July 4th 1776
  34. Portrait of Anton Chekhov (1860-1904) 1902
  35. Deforestation
  36. Generator and Fan Belt in a Car Engine
  37. Thel's Motto, plate 2 from The Book of Thel, 1789
  38. Hampton Institute, 1899
  39. Outback Abstract
  40. Conceptual image of platelet, red blood cell and white blood cell
  41. Harriet Tubman, 1911
  42. Relief depiction of Ramses II, Temple of Luxor, Egypt
  43. Deinonychus
  44. Lion and Gladiator
  45. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  46. Burning Of The New York Crystal Palace On Tuesday October 5th 1858
  47. Vertebrates
  48. Invertebrates