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