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