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  1. Civil War print of Union cavalry soldiers charging a Confederate firing line
  2. Meadow Saffron - Botanical Illustration
  3. The Outward Bound, 1912
  4. Minnesota - USGS State Mosaic
  5. Conceptual image of DNA
  6. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  7. A simplified Herzprung Russell Diagram showing how stars are classified
  8. Richat Structure - USGS Earth as Art
  9. George Washington, by Gilbert Stuart, 1821
  10. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  11. Battle Of Saratoga, 1777
  12. Heather - Botanical Illustration
  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. Blood cells in blood vessel, artwork
  19. The Rape of Europa
  20. Mushroom Chart III
  21. Wisconsin - USGS State Mosaic
  22. Normal spine, X-ray
  23. George And Martha Washington At Presidential Reception
  24. John Adams, by Gilbert Stuart, c. 1800-15
  25. Travels Around the World
  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. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  30. Alternating Motor - Blue
  31. Antique Stock Certificate I
  32. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  33. Vintage American History print of General George Washington at The Battle of Trenton
  34. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  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. 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. Colorized scanning electron micrograph of filamentous Ebola virus particles
  47. Development of Arabic numerals
  48. Cartilage cells, TEM