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  1. George Washington, by Gilbert Stuart, 1821
  2. Earth
  3. Andalgalornis steulleti, a flightless predatory bird
  4. Mercury
  5. Minnesota - USGS State Mosaic
  6. Richat Structure - USGS Earth as Art
  7. A simplified Herzprung Russell Diagram showing how stars are classified
  8. Idaho - USGS State Mosaic
  9. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  10. Costellazioni II
  11. Vintage American History print of General George Washington at The Battle of Trenton
  12. Knight's armor
  13. Heather - Botanical Illustration
  14. Pencils
  15. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  16. Conceptual image of DNA
  17. Capture and Death of Sitting Bull Lithograph
  18. Mushroom Chart II
  19. The Outward Bound, 1912
  20. Vintage Civil War print featuring the Battle of Gettysburg
  21. Paris at Thermopylae
  22. Strength In Numbers
  23. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  24. Blood cells in blood vessel, artwork
  25. Brain antomy, 19th century artwork
  26. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  27. Travels Around the World
  28. Women's Rights Parade, 1917
  29. Sierra de Velasco - USGS Earth as Art
  30. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  31. Antique Stock Certificate I
  32. Alternating Motor - Blue
  33. Wisconsin - USGS State Mosaic
  34. The Presidents Educational Poster, 2017
  35. If I Were A Cloud
  36. Orbits of Earth Crossing Asteroids
  37. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  38. Knights charging into battle
  39. Full on view of a Woolly Mammoth
  40. RMS Titanic during fitting out, 01 January 1912
  41. Mark Twain , 1901
  42. Normal spine, X-ray
  43. San Francisco Chronicle announcing the end of World War I, 1918
  44. 'Nurse's Song,' plate 18 from 'Songs of Innocence,' 1789
  45. Venus
  46. Colorized scanning electron micrograph of filamentous Ebola virus particles
  47. Print of folk hero and frontiersman Davy Crockett
  48. Pipestone Quarry On the Coteau Des Prairies, 1836