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  1. Oregon. Close-up of Graveyard Point Plume Agate stone
  2. Caduceus and graph
  3. Ida B. Wells, 1891
  4. Scanning electron micrograph of HIV particles infecting a human T cell
  5. Battle Of Saratoga, 1777
  6. Conceptual image of DNA
  7. E=mc2 in red
  8. An Ioway Chief
  9. Faridun's Sons Marry the Three Daughters of Sero. Shahnameh. The Book of Kings
  10. Malachite
  11. Desert to Forest - USGS Earth as Art
  12. The human body with superimposed colored plates by Julien Bougle
  13. Vintage Civil War poster of the Battle of Missionary Ridge
  14. Smilodon sabertooth mother and her cubs
  15. The Planet Uranus
  16. Molecule Peppermint
  17. The Nine Year Siege of Troy
  18. Wilson Dam, Alabama, forms portion of the Tennessee River barge route
  19. Conceptual image of human backbone
  20. Plan Of the Campaign In New York And New Jersey, 1776
  21. Columbus, Map, 15th Century
  22. P-38 Lightning Technical: Retro Travel Poster
  23. The nerve supply of the trunk
  24. The Planet Mercury
  25. Object ABC
  26. Keyboard Keys
  27. Franklin
  28. Manuscript Of Fifteenth Amendment To The Constitution
  29. Be Creative
  30. Molecule Chili
  31. Electronics Illustrated, March
  32. Stock Exchange Image Magazine Page
  33. The bones of the head, neck and face
  34. Brain antomy, 19th century artwork
  35. Arthritis of the hip, X-ray
  36. Agate Geode I
  37. Classroom, Derby, 1985
  38. Alphabet For Children, 2002
  39. Molecule Ethanol
  40. Richat Structure - USGS Earth as Art
  41. Tyrannosaurus
  42. A Garland For May Day 1895 Dedicated To The Workers By Walter Crane
  43. Base of human skull, inferior view, with labels
  44. Anti Child Labor Poster, 1913
  45. Energy
  46. Conceptual image of DNA
  47. European Travel
  48. Distillation, 16th century woodcut