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  1. Lung blood vessels
  2. Medical equipment on a tray
  3. Study of the Human Figure, Lateral View
  4. Galloway steam boiler
  5. Molecule Vanilin
  6. No Man's Land - USGS Earth as Art
  7. Cell
  8. Glutamic acid crystals, light micrograph
  9. Mitochondrion, TEM
  10. Malachite
  11. Rosicrucian mystical symbol
  12. Artwork of a Maiasaura dinosaur
  13. Human brain anatomy, lateral view
  14. Healthy adult hand, X-ray
  15. Cardiac muscle and capillary, TEM
  16. Laika the space dog postcard
  17. Neptune, artwork
  18. Gem Stones III
  19. Mathematical Elements II
  20. Teach on Mars and its Moons
  21. Surgical Instruments
  22. 19th century map of the Moon
  23. group portrait of the great American inventors of the Victorian Age, 1862
  24. Cells from a urine infection, SEM
  25. Chrysocolla
  26. Mass spectrometer
  27. 1731 Johann Scheuchzer Creation 4th day b
  28. Blue Watercolor Agate Rectangle
  29. Cherry Tree - Botanical Illustration
  30. Pregnancy
  31. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  32. Vintage Advertisement For Renne's Pain Killing Magic Oil, With Decorative Border
  33. Molecule Licorice
  34. Bright Periodic Table - White, Classic Text
  35. Thomas Edison, US inventor
  36. Arthritis of the knee, X-ray
  37. Optical pattern
  38. Ocean Jasper
  39. Pulmonary veins and arteries. circulation, cardiovascular system
  40. A rabbit witnesses a herd of mammoths in a snowy forest
  41. Purple Watercolor Agate II
  42. Arkansas - USGS State Mosaic
  43. Mississippi River Delta - USGS Earth as Art
  44. Shattuckite Jasper
  45. Solar System II
  46. Human body showing heart and main circulatory system position
  47. Mammals of the Pleistocene era
  48. Molecule Milk