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  1. Columbus, Map, 15th Century
  2. Oregon. Close-up of Graveyard Point Plume Agate stone
  3. Gem Stones III
  4. Mars
  5. Kentucky - USGS State Mosaic
  6. Alexander Mackenzie (1764-1820)
  7. Pathways Educational Poster
  8. Molecule Milk
  9. James Monroe, by Gilbert Stuart, 1817
  10. Nikola Tesla With An Early Tesla Coil
  11. Grammar Lesson
  12. Grey School Chalkboard With Many Different Formulas And Signs
  13. Human digestive system, with labels
  14. Marley's Ghost. Illustration for the novella A Christmas Carol
  15. Arkansas - USGS State Mosaic
  16. Plan Of the Campaign In New York And New Jersey, 1776
  17. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  18. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  19. Strength In Numbers
  20. Meadow Saffron - Botanical Illustration
  21. Desk Tools II
  22. The Rape of Europa
  23. George And Martha Washington At Presidential Reception
  24. Sagenite On Mexican Agate
  25. Men in Armour IV
  26. Parana River Delta - USGS Earth as Art
  27. The Best Teachers
  28. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  29. Alice And The Caterpillar
  30. Washing Gold, Calaveras, California, 1853
  31. Alice and The Cheshire Cat
  32. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  33. Science classroom
  34. Oregon, Owyhee. Close-up of picture jasper stone
  35. Astronomical Chart I
  36. Utah - USGS State Mosaic
  37. Taking Off..., illustration from 'Wings Across the World', 1978
  38. Mushroom Chart III
  39. Caduceus and graph
  40. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  41. History Of Power
  42. Magic Money
  43. Women's Rights Parade, 1917
  44. The Tea Party II
  45. Earth
  46. Portrait of Ulysses S. Grant (1822-85)
  47. George Washington, by Gilbert Stuart, 1821
  48. Siberian Ribbons - USGS Earth as Art