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  1. Conceptual image of DNA
  2. Meadow Saffron - Botanical Illustration
  3. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  4. The Outward Bound, 1912
  5. Minnesota - USGS State Mosaic
  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. Battle Of Saratoga, 1777
  10. George Washington, by Gilbert Stuart, 1821
  11. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  12. Heather - Botanical Illustration
  13. European Travel
  14. Normal spine, X-ray
  15. Oregon. Close-up of Graveyard Point Plume Agate stone
  16. If I Were A Cloud
  17. Paris at Thermopylae
  18. Brain antomy, 19th century artwork
  19. The Rape of Europa
  20. Mushroom Chart III
  21. Blood cells in blood vessel, artwork
  22. Wisconsin - USGS State Mosaic
  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. Alternating Motor - Blue
  30. Antique Stock Certificate I
  31. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  32. RMS Titanic during fitting out, 01 January 1912
  33. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  34. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  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. History Of Power
  40. Mark Twain , 1901
  41. Knights charging into battle
  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. On the deck of the Titanic