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  1. 50 Kilowatt Broadcasting Modulator
  2. Chain Of Molecules
  3. Oklahoma - USGS State Mosaic
  4. Vintage print of Presidents James Garfield, Abraham Lincoln, and William McKinley
  5. John Bunyan. Author Of the Pilgrim's Progress. From The Portrait By Sadler
  6. Death's Door, illustration from 'The Grave, A Poem'
  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. General Robert E. Lee at the Battle of Fredericksburg, 13th December 1862
  12. Assembly Required to Build Our Future on Mars and its Moons
  13. Born to be a Teacher
  14. Rib cage of human skeleton
  15. Michigan - USGS State Mosaic
  16. 1151 Highlanders Resting at the Front, 1918
  17. Abraham Lincoln (1809-65) plans his campaign during the American Civil War (1861-65)
  18. Pylons in a rural landscape at dusk
  19. The Discovery Of Nat Turner
  20. Internal view of the human heart
  21. Taming of the West: The Way of the Law
  22. Work the Night Shift on Martian Moon Phobos
  23. Vintage Civil War poster of the Battle of Missionary Ridge
  24. Anti Child Labor Poster, 1913
  25. The Nine Year Siege of Troy
  26. French fashion designer Yves Saint Laurent with models
  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. To Polish The Sun
  42. Women's Rights Parade, 1917
  43. Conceptual image of DNA
  44. Oscar Wilde
  45. Safety Pin Patent
  46. Red Lancers of the French Old Guard, From Book, 'The Old Guard'
  47. 'London', plate 38 from 'Songs of Experience', 1794
  48. Geometry set