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  1. Plan Of the Campaign In New York And New Jersey, 1776
  2. Prohibition Cartoon, 1920s
  3. Mars
  4. Grammar Lesson
  5. The nerve supply of the trunk
  6. How Seeds Travel
  7. Nikola Tesla With An Early Tesla Coil
  8. Human digestive system, with labels
  9. The Moon
  10. Taking Off..., illustration from 'Wings Across the World', 1978
  11. Alexander Mackenzie (1764-1820)
  12. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  13. Paisley Agate
  14. Costellazioni II
  15. Desk Tools II
  16. Poppy Jasper
  17. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  18. Men in Armour IV
  19. The Rape of Europa
  20. Portrait Of Ida B. Wells Barnett, 1893
  21. Parana River Delta - USGS Earth as Art
  22. American History print of President Washington and Lincoln
  23. Sagenite On Mexican Agate
  24. Science classroom
  25. The Best Teachers
  26. Alice and The Cheshire Cat
  27. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  28. Astronomical Chart I
  29. Utah - USGS State Mosaic
  30. The Summer Road
  31. Oregon, Owyhee. Close-up of picture jasper stone
  32. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  33. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  34. Conceptual image of neuron
  35. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  36. Siberian Ribbons - USGS Earth as Art
  37. Magic Money
  38. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  39. Portrait of Ulysses S. Grant (1822-85)
  40. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  41. The Tea Party II
  42. Andes - USGS Earth as Art
  43. Rice Terraces, Longsheng Ping'an, Guangxi
  44. Andalgalornis steulleti, a flightless predatory bird
  45. Idaho - USGS State Mosaic
  46. Knight's armor
  47. Abraham Lincoln, 1809
  48. Mercury