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