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  1. Sailors on deck of USS Mendota gun boat during American Civil War
  2. Scottish regiment fighting German troops at Battle of Loos
  3. Moses and the Burning Bush
  4. Bright Periodic Table - Black, Modern Text
  5. The Shipwrecked Man and the Sea, illustration from Aesop's Fables
  6. Brooklyn Window #25
  7. Sense of Wonder
  8. John Bunyan. Author Of the Pilgrim's Progress. From The Portrait By Sadler
  9. Technicians Wanted to Engineer our Future on Mars
  10. Arthritis of the hip, X-ray
  11. Teach on Mars and its Moons
  12. Distillation, 16th century woodcut
  13. Normal knee, X-ray
  14. Malachite
  15. Normal hip, X-ray
  16. Chain Of Molecules
  17. Anterior view and sagittal view of female urinary bladder
  18. Relief depicting a pharaoh making an offering, Temple of Luxor, Egypt
  19. Graduated Cylinders And Flasks
  20. Wilson Dam, Alabama, forms portion of the Tennessee River barge route
  21. President John F. Kennedy visits with reporters
  22. Mineralogie I
  23. Human brain anatomy, lateral view
  24. Florida - USGS State Mosaic
  25. First Letter Carried By Pony Express
  26. Abraham Lincoln (1809-65) plans his campaign during the American Civil War (1861-65)
  27. Knocking-off time at the Harland
  28. Study of the Human Figure, Anterior View
  29. Battle of Eylau, Napoleon orders Murat to Charge Russian Army
  30. World War I, Geography
  31. Tennessee - USGS State Mosaic
  32. 'Ar never gets off'
  33. Title Page From The Luther Bible, C.1530
  34. old-fashioned drawing compass
  35. As Pandora Raised The Lid The Cottage Grew Very Dark. Illustration
  36. Montana - USGS State Mosaic
  37. Assembly Required to Build Our Future on Mars and its Moons
  38. William II, Prince of Orange, and his Bride, Mary Stuart, 1641
  39. Scanning electron micrograph of HIV particles infecting a human T cell
  40. Conceptual image of DNA
  41. Signature Of Charles Dickens, 1812-1870. From The Book Bleak House
  42. Solar System - Blue I
  43. One, Two, Buckle my Shoe, from Old Mother Goose's Rhymes and Tales
  44. Death's Door, illustration from 'The Grave, A Poem'
  45. Modern Geode IV
  46. Apollo 13
  47. Grey School Chalkboard With Many Different Formulas And Signs
  48. Venus