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  1. Mars
  2. Grammar Lesson
  3. The nerve supply of the trunk
  4. Pastel Periodic Table - Classic Text
  5. How Seeds Travel
  6. Nikola Tesla With An Early Tesla Coil
  7. The Moon
  8. Human digestive system, with labels
  9. Native Americans Bringing Furs To Dutch Traders
  10. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  11. Alexander Mackenzie (1764-1820)
  12. Paisley Agate
  13. Costellazioni II
  14. Desk Tools II
  15. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  16. Poppy Jasper
  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. The Best Teachers
  23. Science classroom
  24. Sagenite On Mexican Agate
  25. Alice and The Cheshire Cat
  26. Utah - USGS State Mosaic
  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. The Summer Road
  31. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  32. Conceptual image of neuron
  33. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  34. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  35. Siberian Ribbons - USGS Earth as Art
  36. Magic Money
  37. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  38. The Tea Party II
  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. Knight's armor
  44. Idaho - USGS State Mosaic
  45. Andalgalornis steulleti, a flightless predatory bird
  46. Abraham Lincoln, 1809
  47. Mercury
  48. Pencils