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  1. Pennsylvania, Gettysburg, Battle of Gettysburg, tree and battlefield monument, dawn
  2. Vintage Parchment Paper Clip Patent Poster
  3. No Man's Land - USGS Earth as Art
  4. Vintage Civil War print of President Abraham Lincoln and his cabinet
  5. Common Beetles
  6. Be Whoo You Are
  7. How the Titanic Survivors Were Picked Up by the Carpathia
  8. Flatboat, 19th Century
  9. Wheat Mower with Hat, Seen from Behind, by Vincent van Gogh, c. 1870-90
  10. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  11. Alice in the Looking Glass House, from 'Through the Looking Glass' by Lewis Carroll
  12. In With the Horse Herd
  13. San Francisco Chronicle announcing the end of World War I, 1918
  14. Human anatomy showing deep muscles in the neck and upper back
  15. Vintage Parchment Windmill 1906 Patent Poster
  16. Normal hip, X-ray
  17. Wilson Dam, Flood Gates
  18. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  19. Carl Sagan
  20. Lincoln to Washington
  21. Alexander Hamilton, by John Trumbull, 1792
  22. American Frohse Anatomical Wallcharts, Plate II
  23. The Titanic's propellers in the Thompson Graving Dock of Harland
  24. Unfinished Portrait of Napoleon I formerly attributed to Jacques Louis David 1808
  25. Tuberculosis, Don't Kiss Me!: Your Kiss of Affection, the Germ of Infection - WPA Poster
  26. Sir John Hawkins (1532-95)
  27. Digestive system, artwork
  28. Chinese acupuncture model
  29. John Brown on 30 August 1856 intercepting a body of pro-slavery men
  30. Jacob's Pharmacy
  31. Cherry Tree - Botanical Illustration
  32. Decorative Lintel from the ancient Mayan city of Yaxchilan, Chiapas, Mexico
  33. Illustrated USA
  34. Bolivia, Potosi, Amethyst in a Bolivian museum
  35. Indigo Agate C
  36. Annie Oakley, 1860 - 1926, American Sharpshooter And Exhibition Shooter
  37. Hello Calculator
  38. The Lion, Jupiter and the Elephant, illustration from Aesop's Fables
  39. Poe
  40. Pi to 2198 decimal place
  41. Portrait Of Rosa Parks, Civil Rights Leader
  42. Superior view of human brain with colored lobes and labels
  43. Vintage Civil War print of a Union Drummer Boy holding a rifle on battlefield
  44. Earth
  45. Surveyors Wanted to Explore Mars and its Moons
  46. Egyptian and Assyrian counting systems
  47. Mistletoe - Botanical Illustration
  48. The Fir-Tree and the Bramble, illustration from Aesop's Fables