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  1. Teddy
  2. Famous prehistoric rock paintings of Tassili N'Ajjer, Algeria
  3. Albert Einstein, 1879 - 1955, German Born Theoretical Physicist
  4. Vintage Parchment Stethoscope Patent Poster
  5. Animal Life Spans
  6. Bronchial tree and lungs, artwork
  7. Che Guevara
  8. The building of the Union Pacific Railroad
  9. The Rainforest
  10. World War II painting of Winston Churchill wearing his RAF uniform
  11. Alternating Motor - Blue
  12. Muir Woods National Monument, California - John Muir Portrait: Retro Poster
  13. Portrait of Samuel Adams (1722-1803)
  14. Soap bubbles on a dodecahedral frame
  15. Moses and the Burning Bush
  16. Replica Of Eli Whitney's Cotton Gin
  17. Spatial dimensions, conceptual artwork
  18. Patent--Light Bulb
  19. The Optimist - USGS Earth as Art
  20. Hairdresser
  21. Print of folk hero and frontiersman Davy Crockett
  22. Vintage Parchment Incandescent Lamp Socket Patent Poster
  23. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  24. Thomas
  25. Sierra de Velasco - USGS Earth as Art
  26. Women's Rights Parade, 1913
  27. Photomicroscopic close up of a snowflake crystal
  28. Practical Mechanics, November 1955
  29. Normal knee, X-ray
  30. The Outward Bound, 1912
  31. Vintage Parchment Tesla Operating Electric Motors Map Poster
  32. The Last of the Spirits. Illustration for the novella A Christmas Carol
  33. Christian's Conflict With Apollyon. From The Book The Pilgrim's Progress
  34. Stamp out Syphilis and Gonorrhea - WPA Poster
  35. Mohawk Village, 1780
  36. Moon Walk
  37. Purple Watercolor Agate I
  38. Muhammad Ali on the shore of the Congo River, Kinshasa, Zaire
  39. Colon blood vessels, light micrograph
  40. Marie Curie
  41. Colorized image of HIV-infected H9 T-cell
  42. Early Stone Implements
  43. Von Karman Vortices - USGS Earth as Art
  44. Molecule Water
  45. American War of Independence
  46. 'Rheumatoid arthritis of the hands, X-ray
  47. The Planet Mars
  48. Pair of human hands on black background.