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  1. Conversion
  2. How Seeds Travel
  3. Pathways Educational Poster
  4. Prohibition Cartoon, 1920s
  5. Caduceus and graph
  6. Human digestive system, with labels
  7. Kentucky - USGS State Mosaic
  8. Columbus, Map, 15th Century
  9. Alexander Mackenzie (1764-1820)
  10. Plan Of the Campaign In New York And New Jersey, 1776
  11. Molecule Milk
  12. Mars
  13. Nikola Tesla With An Early Tesla Coil
  14. Grammar Lesson
  15. Rice Terraces, Longsheng Ping'an, Guangxi
  16. Marley's Ghost. Illustration for the novella A Christmas Carol
  17. Arkansas - USGS State Mosaic
  18. Oregon. Close-up of Graveyard Point Plume Agate stone
  19. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  20. Meadow Saffron - Botanical Illustration
  21. Conceptual image of neuron
  22. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  23. Desk Tools II
  24. The Rape of Europa
  25. Grey School Chalkboard With Many Different Formulas And Signs
  26. American History print of President Washington and Lincoln
  27. Men in Armour IV
  28. Costellazioni II
  29. Taking Off..., illustration from 'Wings Across the World', 1978
  30. Parana River Delta - USGS Earth as Art
  31. The Best Teachers
  32. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  33. Washing Gold, Calaveras, California, 1853
  34. Oregon, Owyhee. Close-up of picture jasper stone
  35. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  36. Science classroom
  37. Sagenite On Mexican Agate
  38. Alice and The Cheshire Cat
  39. Astronomical Chart I
  40. Mushroom Chart III
  41. Utah - USGS State Mosaic
  42. The Tea Party II
  43. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  44. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  45. Magic Money
  46. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  47. Portrait of Ulysses S. Grant (1822-85)
  48. Abraham Lincoln, 1809