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  1. Columbus, Map, 15th Century
  2. Prohibition Cartoon, 1920s
  3. Plan Of the Campaign In New York And New Jersey, 1776
  4. The nerve supply of the trunk
  5. Grammar Lesson
  6. Mars
  7. Human digestive system, with labels
  8. Rice Terraces, Longsheng Ping'an, Guangxi
  9. Molecule Milk
  10. How Seeds Travel
  11. Nikola Tesla With An Early Tesla Coil
  12. Taking Off..., illustration from 'Wings Across the World', 1978
  13. The Moon
  14. Portrait Of Ida B. Wells Barnett, 1893
  15. Alexander Mackenzie (1764-1820)
  16. Paisley Agate
  17. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  18. Costellazioni II
  19. Oregon. Close-up of Graveyard Point Plume Agate stone
  20. Desk Tools II
  21. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  22. The Rape of Europa
  23. Men in Armour IV
  24. Mushroom Chart III
  25. Poppy Jasper
  26. Parana River Delta - USGS Earth as Art
  27. American History print of President Washington and Lincoln
  28. Sagenite On Mexican Agate
  29. Science classroom
  30. The Best Teachers
  31. Alice and The Cheshire Cat
  32. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  33. Utah - USGS State Mosaic
  34. The Summer Road
  35. Astronomical Chart I
  36. Oregon, Owyhee. Close-up of picture jasper stone
  37. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  38. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  39. Conceptual image of neuron
  40. Siberian Ribbons - USGS Earth as Art
  41. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  42. Magic Money
  43. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  44. The Tea Party II
  45. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  46. Portrait of Ulysses S. Grant (1822-85)
  47. Andes - USGS Earth as Art
  48. Idaho - USGS State Mosaic