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  1. Prohibition Cartoon, 1920s
  2. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  3. Mars
  4. Grammar Lesson
  5. Nikola Tesla With An Early Tesla Coil
  6. How Seeds Travel
  7. Pastel Periodic Table - Classic Text
  8. The Moon
  9. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  10. Costellazioni II
  11. Paisley Agate
  12. Alexander Mackenzie (1764-1820)
  13. Native Americans Bringing Furs To Dutch Traders
  14. Human digestive system, with labels
  15. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  16. Desk Tools II
  17. Poppy Jasper
  18. Men in Armour IV
  19. Vintage print of Presidents James Garfield, Abraham Lincoln, and William McKinley
  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. The Best Teachers
  24. Science classroom
  25. American History print of President Washington and Lincoln
  26. Alice and The Cheshire Cat
  27. Astronomical Chart I
  28. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  29. The Summer Road
  30. Oregon, Owyhee. Close-up of picture jasper stone
  31. Wingate Pass Agate, Ca
  32. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  33. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  34. Conceptual image of neuron
  35. Magic Money
  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. Portrait of Ulysses S. Grant (1822-85)
  42. Andes - USGS Earth as Art
  43. Rice Terraces, Longsheng Ping'an, Guangxi
  44. Andalgalornis steulleti, a flightless predatory bird
  45. Knight's armor
  46. Idaho - USGS State Mosaic
  47. Pencils
  48. The Outward Bound, 1912