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  1. Meadow Saffron - Botanical Illustration
  2. Conceptual image of DNA
  3. Minnesota - USGS State Mosaic
  4. The Outward Bound, 1912
  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. Richat Structure - USGS Earth as Art
  8. A simplified Herzprung Russell Diagram showing how stars are classified
  9. Heather - Botanical Illustration
  10. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  11. Battle Of Saratoga, 1777
  12. George Washington, by Gilbert Stuart, 1821
  13. Normal spine, X-ray
  14. European Travel
  15. Wisconsin - USGS State Mosaic
  16. Oregon. Close-up of Graveyard Point Plume Agate stone
  17. If I Were A Cloud
  18. Paris at Thermopylae
  19. Brain antomy, 19th century artwork
  20. Blood cells in blood vessel, artwork
  21. Mushroom Chart III
  22. The Rape of Europa
  23. Travels Around the World
  24. George And Martha Washington At Presidential Reception
  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. Alternating Motor - Blue
  30. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  31. Antique Stock Certificate I
  32. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  33. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  34. Vintage American History print of General George Washington at The Battle of Trenton
  35. RMS Titanic during fitting out, 01 January 1912
  36. Capture and Death of Sitting Bull Lithograph
  37. Pipestone Quarry On the Coteau Des Prairies, 1836
  38. 'Nurse's Song,' plate 18 from 'Songs of Innocence,' 1789
  39. The Optimist - USGS Earth as Art
  40. Knights charging into battle
  41. Mark Twain , 1901
  42. History Of Power
  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. On the deck of the Titanic