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  1. Mushroom Chart I light
  2. Official White House Portrait Of George H. W. Bush By Herbert Abrams
  3. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  4. Teachers III Blue
  5. Vintage Parchment Hydraulic Drilling Rig Patent Poster
  6. The Planet Neptune
  7. Dental X-ray
  8. Civil War print depicting the Union Army's capture of Fort Fisher
  9. Graduated Cylinders And Flasks
  10. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  11. The nerve supply of the upper body
  12. Assembly Required to Build Our Future on Mars and its Moons
  13. Venus
  14. Paris at Thermopylae
  15. Sigmund Freud
  16. Colorado - USGS State Mosaic
  17. Battle Of Gettysburg, 1863
  18. Sohrab Facing the Tent of the Persian Army Leaders. Shahnameh. The Book of Kings. 16th c
  19. The Battle of Bosworth - Into Battle
  20. Vintage Parchment Otoscope Patent Print
  21. Civil War Fort I
  22. Detail of hieroglyphic writing. Museum of Fine Arts. Budapest. Hungary
  23. How Seeds Travel
  24. Paul Charles Morphy (1837-84) engraved by D.J. Pound from a photograph
  25. Study of the Human Figure, Anterior View
  26. Mohawk Village, 1780
  27. Venus I
  28. Portrait of Ulysses S. Grant (1822-85)
  29. Balance
  30. Good Grades and Good Health Go Together - WPA Poster
  31. The Planet Venus
  32. Abraham Lincoln (1809-65) plans his campaign during the American Civil War (1861-65)
  33. Mexican Revolution (1910-19). Train with wounded revolutionary fighters
  34. Utah - USGS State Mosaic
  35. Sierra de Velasco - USGS Earth as Art
  36. Miss Havisham. Illustration for the Charles Dickens novel Great Expectations 1910
  37. David Copperfield. Illustration for the Charles Dickens novel David Copperfield
  38. Titanic
  39. Living Relatives of Dinoaurs
  40. Electric Tattooing Device, Charles Wagner, 1904
  41. Photomicroscopic close up of a snowflake crystal
  42. World War I, Map, c1919
  43. Anterior view of human pelvis, with labels
  44. Ida B. Wells, 1891
  45. California, Summit City, Shasta Dam, Shasta Lake, with view of Mt. Shasta
  46. Development of Arabic numerals
  47. Caduceus and graph
  48. Oregon. Close-up of Graveyard Point Plume Agate stone