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  1. Caduceus and graph
  2. Gem Stones I
  3. Garden Tulip - Botanical Illustration
  4. Arkansas - USGS State Mosaic
  5. Marley's Ghost. Illustration for the novella A Christmas Carol
  6. Prohibition Cartoon, 1920s
  7. Mars
  8. Grammar Lesson
  9. The nerve supply of the trunk
  10. Nikola Tesla With An Early Tesla Coil
  11. The Moon
  12. Human digestive system, with labels
  13. Native Americans Bringing Furs To Dutch Traders
  14. Paisley Agate
  15. Costellazioni II
  16. Alexander Mackenzie (1764-1820)
  17. Men in Armour IV
  18. Taking Off..., illustration from 'Wings Across the World', 1978
  19. Parana River Delta - USGS Earth as Art
  20. Portrait Of Ida B. Wells Barnett, 1893
  21. American History print of President Washington and Lincoln
  22. Alice and The Cheshire Cat
  23. Astronomical Chart I
  24. Fagin in the Condemned Cell. Illustration for the novel Oliver Twist
  25. Utah - USGS State Mosaic
  26. Wingate Pass Agate, Ca
  27. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  28. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  29. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  30. Portrait of Ulysses S. Grant (1822-85)
  31. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  32. Andes - USGS Earth as Art
  33. Rice Terraces, Longsheng Ping'an, Guangxi
  34. Andalgalornis steulleti, a flightless predatory bird
  35. Idaho - USGS State Mosaic
  36. Pencils
  37. Mercury
  38. Meadow Saffron - Botanical Illustration
  39. George Washington, by Gilbert Stuart, 1821
  40. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  41. Battle Of Saratoga, 1777
  42. Normal spine, X-ray
  43. Oregon. Close-up of Graveyard Point Plume Agate stone
  44. Wisconsin - USGS State Mosaic
  45. Paris at Thermopylae
  46. Brain antomy, 19th century artwork
  47. Blood cells in blood vessel, artwork
  48. The Rape of Europa