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  1. Mars
  2. Prohibition Cartoon, 1920s
  3. Grammar Lesson
  4. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  5. Pastel Periodic Table - Classic Text
  6. Nikola Tesla With An Early Tesla Coil
  7. How Seeds Travel
  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. Costellazioni II
  12. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  13. Paisley Agate
  14. Alexander Mackenzie (1764-1820)
  15. Desk Tools II
  16. Human digestive system, with labels
  17. Men in Armour IV
  18. Vintage print of Presidents James Garfield, Abraham Lincoln, and William McKinley
  19. Parana River Delta - USGS Earth as Art
  20. Taking Off..., illustration from 'Wings Across the World', 1978
  21. The Summer Road
  22. Portrait Of Ida B. Wells Barnett, 1893
  23. The Best Teachers
  24. Alice and The Cheshire Cat
  25. Science classroom
  26. American History print of President Washington and Lincoln
  27. Poppy Jasper
  28. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  29. Astronomical Chart I
  30. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  31. Wingate Pass Agate, Ca
  32. Oregon, Owyhee. Close-up of picture jasper stone
  33. Conceptual image of neuron
  34. Magic Money
  35. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  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. Minnesota - USGS State Mosaic
  40. Andes - USGS Earth as Art
  41. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  42. Rice Terraces, Longsheng Ping'an, Guangxi
  43. Idaho - USGS State Mosaic
  44. Andalgalornis steulleti, a flightless predatory bird
  45. Portrait of Ulysses S. Grant (1822-85)
  46. Knight's armor
  47. Pencils
  48. The Outward Bound, 1912