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  1. Mercury
  2. The Outward Bound, 1912
  3. Meadow Saffron - Botanical Illustration
  4. Conceptual image of DNA
  5. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  6. Civil War print of Union cavalry soldiers charging a Confederate firing line
  7. A simplified Herzprung Russell Diagram showing how stars are classified
  8. Richat Structure - USGS Earth as Art
  9. Wisconsin - USGS State Mosaic
  10. Battle Of Saratoga, 1777
  11. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  12. Heather - Botanical Illustration
  13. European Travel
  14. George Washington, by Gilbert Stuart, 1821
  15. Normal spine, X-ray
  16. Sagenite On Mexican Agate
  17. Oregon. Close-up of Graveyard Point Plume Agate stone
  18. If I Were A Cloud
  19. Paris at Thermopylae
  20. Utah - USGS State Mosaic
  21. Brain antomy, 19th century artwork
  22. Mushroom Chart III
  23. Blood cells in blood vessel, artwork
  24. The Rape of Europa
  25. Travels Around the World
  26. Women's Rights Parade, 1917
  27. George And Martha Washington At Presidential Reception
  28. John Adams, by Gilbert Stuart, c. 1800-15
  29. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  30. Sierra de Velasco - USGS Earth as Art
  31. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  32. Antique Stock Certificate I
  33. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  34. Alternating Motor - Blue
  35. RMS Titanic during fitting out, 01 January 1912
  36. Capture and Death of Sitting Bull Lithograph
  37. Vintage American History print of General George Washington at The Battle of Trenton
  38. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  39. Pipestone Quarry On the Coteau Des Prairies, 1836
  40. 'Nurse's Song,' plate 18 from 'Songs of Innocence,' 1789
  41. Mark Twain , 1901
  42. The Optimist - USGS Earth as Art
  43. History Of Power
  44. Venus
  45. Full on view of a Woolly Mammoth
  46. Cartilage cells, TEM
  47. Colorized scanning electron micrograph of filamentous Ebola virus particles
  48. San Francisco Chronicle announcing the end of World War I, 1918