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  1. Prohibition Cartoon, 1920s
  2. Mars
  3. Nikola Tesla With An Early Tesla Coil
  4. Pastel Periodic Table - Classic Text
  5. How Seeds Travel
  6. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  7. The Moon
  8. Native Americans Bringing Furs To Dutch Traders
  9. Costellazioni II
  10. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  11. Paisley Agate
  12. Desk Tools II
  13. Alexander Mackenzie (1764-1820)
  14. Human digestive system, with labels
  15. Men in Armour IV
  16. Taking Off..., illustration from 'Wings Across the World', 1978
  17. Parana River Delta - USGS Earth as Art
  18. Vintage print of Presidents James Garfield, Abraham Lincoln, and William McKinley
  19. Portrait Of Ida B. Wells Barnett, 1893
  20. The Summer Road
  21. The Best Teachers
  22. Science classroom
  23. Alice and The Cheshire Cat
  24. American History print of President Washington and Lincoln
  25. Poppy Jasper
  26. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  27. Astronomical Chart I
  28. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  29. Oregon, Owyhee. Close-up of picture jasper stone
  30. Wingate Pass Agate, Ca
  31. Magic Money
  32. Conceptual image of neuron
  33. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  34. The Tea Party II
  35. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  36. Siberian Ribbons - USGS Earth as Art
  37. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  38. Minnesota - USGS State Mosaic
  39. Andes - USGS Earth as Art
  40. Rice Terraces, Longsheng Ping'an, Guangxi
  41. Idaho - USGS State Mosaic
  42. Andalgalornis steulleti, a flightless predatory bird
  43. Portrait of Ulysses S. Grant (1822-85)
  44. Knight's armor
  45. Pencils
  46. The Outward Bound, 1912
  47. Abraham Lincoln, 1809
  48. Conceptual image of DNA