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  1. Native Americans Bringing Furs To Dutch Traders
  2. How Seeds Travel
  3. Conversion
  4. Kentucky - USGS State Mosaic
  5. Pathways Educational Poster
  6. Human digestive system, with labels
  7. Caduceus and graph
  8. Prohibition Cartoon, 1920s
  9. Alexander Mackenzie (1764-1820)
  10. Plan Of the Campaign In New York And New Jersey, 1776
  11. Molecule Milk
  12. Mars
  13. Poppy Jasper
  14. Nikola Tesla With An Early Tesla Coil
  15. Grammar Lesson
  16. Rice Terraces, Longsheng Ping'an, Guangxi
  17. Arkansas - USGS State Mosaic
  18. Marley's Ghost. Illustration for the novella A Christmas Carol
  19. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  20. Oregon. Close-up of Graveyard Point Plume Agate stone
  21. Meadow Saffron - Botanical Illustration
  22. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  23. Conceptual image of neuron
  24. Desk Tools II
  25. Grey School Chalkboard With Many Different Formulas And Signs
  26. American History print of President Washington and Lincoln
  27. Costellazioni II
  28. Men in Armour IV
  29. The Rape of Europa
  30. Mushroom Chart III
  31. Taking Off..., illustration from 'Wings Across the World', 1978
  32. Parana River Delta - USGS Earth as Art
  33. The Best Teachers
  34. The Summer Road
  35. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  36. Science classroom
  37. Oregon, Owyhee. Close-up of picture jasper stone
  38. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  39. Sagenite On Mexican Agate
  40. Alice and The Cheshire Cat
  41. Astronomical Chart I
  42. Utah - USGS State Mosaic
  43. The Tea Party II
  44. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  45. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  46. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  47. Magic Money
  48. Andes - USGS Earth as Art