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