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  1. Prohibition Cartoon, 1920s
  2. Mars
  3. Pastel Periodic Table - Classic Text
  4. Grammar Lesson
  5. The nerve supply of the trunk
  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. Desk Tools II
  12. Paisley Agate
  13. Alexander Mackenzie (1764-1820)
  14. Costellazioni II
  15. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  16. Poppy Jasper
  17. Men in Armour IV
  18. Portrait Of Ida B. Wells Barnett, 1893
  19. Taking Off..., illustration from 'Wings Across the World', 1978
  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. Utah - USGS State Mosaic
  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. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  32. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  33. Conceptual image of neuron
  34. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  35. Magic Money
  36. Siberian Ribbons - USGS Earth as Art
  37. The Tea Party II
  38. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  39. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  40. Portrait of Ulysses S. Grant (1822-85)
  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. Mercury
  47. Abraham Lincoln, 1809
  48. Pencils