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