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  1. Abraham Lincoln, 1809
  2. A pair of Allosaurus dinosaurs explore the remains of a Diplodocus carcass
  3. Civil War print of Union cavalry soldiers charging a Confederate firing line
  4. Conceptual image of DNA
  5. Meadow Saffron - Botanical Illustration
  6. Oregon. Close-up of Graveyard Point Plume Agate stone
  7. Mercury
  8. A simplified Herzprung Russell Diagram showing how stars are classified
  9. Wisconsin - USGS State Mosaic
  10. Richat Structure - USGS Earth as Art
  11. Battle Of Saratoga, 1777
  12. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  13. Heather - Botanical Illustration
  14. George Washington, by Gilbert Stuart, 1821
  15. European Travel
  16. Normal spine, X-ray
  17. If I Were A Cloud
  18. Sagenite On Mexican Agate
  19. Paris at Thermopylae
  20. Utah - USGS State Mosaic
  21. Brain antomy, 19th century artwork
  22. Mushroom Chart III
  23. Blood cells in blood vessel, artwork
  24. The Rape of Europa
  25. Travels Around the World
  26. John Adams, by Gilbert Stuart, c. 1800-15
  27. Women's Rights Parade, 1917
  28. George And Martha Washington At Presidential Reception
  29. Oil well pump jacks at Bakken Oil Field near Estevan, Saskatchewan, Canada
  30. Sierra de Velasco - USGS Earth as Art
  31. Antique Stock Certificate I
  32. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  33. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  34. RMS Titanic during fitting out, 01 January 1912
  35. Capture and Death of Sitting Bull Lithograph
  36. Vintage American History print of General George Washington at The Battle of Trenton
  37. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  38. Alternating Motor - Blue
  39. Pipestone Quarry On the Coteau Des Prairies, 1836
  40. Mark Twain , 1901
  41. The Optimist - USGS Earth as Art
  42. 'Nurse's Song,' plate 18 from 'Songs of Innocence,' 1789
  43. History Of Power
  44. Venus
  45. Cartilage cells, TEM
  46. Full on view of a Woolly Mammoth
  47. Development of Arabic numerals
  48. San Francisco Chronicle announcing the end of World War I, 1918