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  1. Abraham Lincoln, 1809
  2. Mushroom Chart II
  3. Civil War print of Union cavalry soldiers charging a Confederate firing line
  4. Pencils
  5. Meadow Saffron - Botanical Illustration
  6. Mercury
  7. Knight's armor
  8. Conceptual image of DNA
  9. The Outward Bound, 1912
  10. Minnesota - USGS State Mosaic
  11. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  12. Richat Structure - USGS Earth as Art
  13. A simplified Herzprung Russell Diagram showing how stars are classified
  14. Idaho - USGS State Mosaic
  15. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  16. Battle Of Saratoga, 1777
  17. Heather - Botanical Illustration
  18. George Washington, by Gilbert Stuart, 1821
  19. Vintage American History print of General George Washington at The Battle of Trenton
  20. Paris at Thermopylae
  21. History Of Power
  22. If I Were A Cloud
  23. Blood cells in blood vessel, artwork
  24. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  25. Brain antomy, 19th century artwork
  26. George And Martha Washington At Presidential Reception
  27. Wisconsin - USGS State Mosaic
  28. Normal spine, X-ray
  29. Travels Around the World
  30. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  31. Sierra de Velasco - USGS Earth as Art
  32. Women's Rights Parade, 1917
  33. The Presidents Educational Poster, 2017
  34. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  35. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  36. Antique Stock Certificate I
  37. Alternating Motor - Blue
  38. Capture and Death of Sitting Bull Lithograph
  39. Pipestone Quarry On the Coteau Des Prairies, 1836
  40. RMS Titanic during fitting out, 01 January 1912
  41. 'Nurse's Song,' plate 18 from 'Songs of Innocence,' 1789
  42. Knights charging into battle
  43. Mark Twain , 1901
  44. Full on view of a Woolly Mammoth
  45. Venus
  46. San Francisco Chronicle announcing the end of World War I, 1918
  47. Colorized scanning electron micrograph of filamentous Ebola virus particles
  48. Development of Arabic numerals