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  1. Mercury
  2. Civil War print of Union cavalry soldiers charging a Confederate firing line
  3. Andalgalornis steulleti, a flightless predatory bird
  4. Abraham Lincoln, 1809
  5. Minnesota - USGS State Mosaic
  6. Pencils
  7. Mushroom Chart II
  8. Conceptual image of DNA
  9. The Outward Bound, 1912
  10. Meadow Saffron - Botanical Illustration
  11. Richat Structure - USGS Earth as Art
  12. History Of Power
  13. A simplified Herzprung Russell Diagram showing how stars are classified
  14. Idaho - USGS State Mosaic
  15. Battle Of Saratoga, 1777
  16. Heather - Botanical Illustration
  17. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  18. Knight's armor
  19. Vintage American History print of General George Washington at The Battle of Trenton
  20. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  21. Paris at Thermopylae
  22. Vintage Civil War print featuring the Battle of Gettysburg
  23. If I Were A Cloud
  24. Blood cells in blood vessel, artwork
  25. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  26. Brain antomy, 19th century artwork
  27. George And Martha Washington At Presidential Reception
  28. Wisconsin - USGS State Mosaic
  29. Normal spine, X-ray
  30. Travels Around the World
  31. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  32. Capture and Death of Sitting Bull Lithograph
  33. Sierra de Velasco - USGS Earth as Art
  34. Women's Rights Parade, 1917
  35. The Presidents Educational Poster, 2017
  36. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  37. Alternating Motor - Blue
  38. Antique Stock Certificate I
  39. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  40. Knights charging into battle
  41. RMS Titanic during fitting out, 01 January 1912
  42. Mark Twain , 1901
  43. 'Nurse's Song,' plate 18 from 'Songs of Innocence,' 1789
  44. Full on view of a Woolly Mammoth
  45. Venus
  46. San Francisco Chronicle announcing the end of World War I, 1918
  47. Pipestone Quarry On the Coteau Des Prairies, 1836
  48. Colorized scanning electron micrograph of filamentous Ebola virus particles