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  1. Tuberculosis, Don't Kiss Me!: Your Kiss of Affection, the Germ of Infection - WPA Poster
  2. Bright Periodic Table - Black, Modern Text
  3. Caribbean Luxury - USGS Earth as Art
  4. Paul Charles Morphy (1837-84) engraved by D.J. Pound from a photograph
  5. General Philip Kearny's fatal charge at the Battle of Chantilly
  6. Colorized image of HIV-infected H9 T-cell
  7. Mineralogie I
  8. Sailors on deck of USS Mendota gun boat during American Civil War
  9. Relief depicting a pharaoh making an offering, Temple of Luxor, Egypt
  10. Zora Hurston Beating The Hountar (Mama Drum), 1937
  11. The Shipwrecked Man and the Sea, illustration from Aesop's Fables
  12. Human brain anatomy, lateral view
  13. Samuel Langhorne Clemens, 1835
  14. John Bunyan. Author Of the Pilgrim's Progress. From The Portrait By Sadler
  15. Distillation, 16th century woodcut
  16. Sense of Wonder
  17. Graduated Cylinders And Flasks
  18. Marie Curie
  19. Normal knee, X-ray
  20. Brooklyn Window #25
  21. World War I, Geography
  22. Pipes at Nesjavellir Geothermal Power Plant, Iceland
  23. Assembly Required to Build Our Future on Mars and its Moons
  24. Work the Night Shift on Martian Moon Phobos
  25. Chain Of Molecules
  26. The musculoskeleton of the jaw
  27. Wilson Dam, Alabama, forms portion of the Tennessee River barge route
  28. Scanning electron micrograph of HIV particles infecting a human T cell
  29. Malachite
  30. First Letter Carried By Pony Express
  31. William Edward Burghardt Du Bois, African-American Scholar And Civil Rights Activist
  32. Arthritis of the hip, X-ray
  33. Anterior view and sagittal view of female urinary bladder
  34. Study of the Human Figure, Anterior View
  35. The vertebral column
  36. Title Page From The Luther Bible, C.1530
  37. old-fashioned drawing compass
  38. 'Ar never gets off'
  39. Human Skeleton: Lateral view in Crouching Posture
  40. William II, Prince of Orange, and his Bride, Mary Stuart, 1641
  41. Normal hip, X-ray
  42. The bones of the neck
  43. Conceptual image of DNA
  44. Apollo 13
  45. Gold Leaf Agate
  46. Puerto Rico - USGS State Mosaic
  47. Signature Of Charles Dickens, 1812-1870. From The Book Bleak House
  48. Knocking-off time at the Harland