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  1. How Seeds Travel
  2. Kentucky - USGS State Mosaic
  3. Prohibition Cartoon, 1920s
  4. Alexander Mackenzie (1764-1820)
  5. Poppy Jasper
  6. Nikola Tesla With An Early Tesla Coil
  7. Grammar Lesson
  8. Rice Terraces, Longsheng Ping'an, Guangxi
  9. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  10. Oregon. Close-up of Graveyard Point Plume Agate stone
  11. Conceptual image of neuron
  12. American History print of President Washington and Lincoln
  13. Taking Off..., illustration from 'Wings Across the World', 1978
  14. Science classroom
  15. The Summer Road
  16. Sagenite On Mexican Agate
  17. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  18. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  19. Magic Money
  20. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  21. Civil War print of Union cavalry soldiers charging a Confederate firing line
  22. Conceptual image of DNA
  23. A simplified Herzprung Russell Diagram showing how stars are classified
  24. Vintage American History print of General George Washington at The Battle of Trenton
  25. Drafting the Declaration of Independence, 28th June 1776, detail of Thomas Jefferson
  26. Capture and Death of Sitting Bull Lithograph
  27. The Outward Bound, 1912
  28. Vintage Civil War print featuring the Battle of Gettysburg
  29. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  30. George And Martha Washington At Presidential Reception
  31. Blood cells in blood vessel, artwork
  32. Strength In Numbers
  33. Travels Around the World
  34. Women's Rights Parade, 1917
  35. Antique Stock Certificate I
  36. RMS Titanic during fitting out, 01 January 1912
  37. Mark Twain , 1901
  38. Pipestone Quarry On the Coteau Des Prairies, 1836
  39. On the deck of the Titanic
  40. The sun sets behind a row of spinning windmills or wind turbines
  41. United States Fun Facts
  42. Battle Of Gettysburg, 1863
  43. European Travel
  44. Cross section image of human head
  45. The four terrestrial planets compared in scale
  46. The First Public Reading of the Declaration of Independence
  47. The Nine Year Siege of Troy
  48. Battle of Eylau, Napoleon orders Murat to Charge Russian Army