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  1. 50 Kilowatt Broadcasting Modulator
  2. Chain Of Molecules
  3. Oklahoma - USGS State Mosaic
  4. John Bunyan. Author Of the Pilgrim's Progress. From The Portrait By Sadler
  5. Death's Door, illustration from 'The Grave, A Poem'
  6. Vintage print of Presidents James Garfield, Abraham Lincoln, and William McKinley
  7. Moses and the Burning Bush
  8. Blood vessels and kidneys, artwork
  9. Portrait of Booker T. Washington sitting in a chair
  10. Scene From Little Red Riding Hood By Charles Perrault, 1880
  11. Assembly Required to Build Our Future on Mars and its Moons
  12. General Robert E. Lee at the Battle of Fredericksburg, 13th December 1862
  13. Rib cage of human skeleton
  14. Michigan - USGS State Mosaic
  15. 1151 Highlanders Resting at the Front, 1918
  16. Born to be a Teacher
  17. Pylons in a rural landscape at dusk
  18. Abraham Lincoln (1809-65) plans his campaign during the American Civil War (1861-65)
  19. The Discovery Of Nat Turner
  20. Internal view of the human heart
  21. Work the Night Shift on Martian Moon Phobos
  22. Taming of the West: The Way of the Law
  23. Vintage Civil War poster of the Battle of Missionary Ridge
  24. Anti Child Labor Poster, 1913
  25. French fashion designer Yves Saint Laurent with models
  26. The Nine Year Siege of Troy
  27. Shame may be Fatal - WPA Poster
  28. The Swedish Warship Vasa
  29. Civil War, Texas Rangers, 1861
  30. Portrait Of Ida B. Wells Barnett, 1893
  31. Mississippi River Delta - USGS Earth as Art
  32. Civil War, Atlanta, c1863
  33. Alexander Hamilton, by John Trumbull, 1792
  34. First Moon Men, Conceptual Art
  35. Richat Structure - USGS Earth as Art
  36. Von Karman Vortices - USGS Earth as Art
  37. World War I, Geography
  38. Christian Loses His Burden At The Cross. From The Book The Pilgrim's Progress
  39. The Flying Dutchman And Voltigeur Running The Great Match At York Racecourse
  40. Denver, Colorado, 1859
  41. Women's Rights Parade, 1917
  42. To Polish The Sun
  43. Conceptual image of DNA
  44. Oscar Wilde
  45. 'London', plate 38 from 'Songs of Experience', 1794
  46. Safety Pin Patent
  47. Red Lancers of the French Old Guard, From Book, 'The Old Guard'
  48. Geometry set