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  1. Grammar Lesson
  2. Pastel Periodic Table - Classic Text
  3. How Seeds Travel
  4. Nikola Tesla With An Early Tesla Coil
  5. Native Americans Bringing Furs To Dutch Traders
  6. Paisley Agate
  7. Alexander Mackenzie (1764-1820)
  8. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  9. Poppy Jasper
  10. Taking Off..., illustration from 'Wings Across the World', 1978
  11. American History print of President Washington and Lincoln
  12. Science classroom
  13. Sagenite On Mexican Agate
  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. The Outward Bound, 1912
  22. Conceptual image of DNA
  23. Civil War print of Union cavalry soldiers charging a Confederate firing line
  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. Capture and Death of Sitting Bull Lithograph
  34. Vintage American History print of General George Washington at The Battle of Trenton
  35. RMS Titanic during fitting out, 01 January 1912
  36. Ferdinand Magellan (1480-1521) on discovering the Pacific Ocean
  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. Sense of Wonder
  47. Strength In Numbers
  48. Wilson Dam, Alabama, forms portion of the Tennessee River barge route