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  1. Painting of George Washington crossing the Delaware
  2. Vintage Civil War print of the Battle of Gettysburg
  3. Herb Chart on Black
  4. The onboard gym on the Titanic showing the rowing machines and exercise bikes, 1912
  5. Vintage Civil War print of the Battle of Gettysburg
  6. Laws of Motion I
  7. Apache Group, c1906
  8. Close-Up Royal Aztec Lace Agate
  9. Emperor Napoleon in His Study at the Tuileries, by Jacques-Louis David, 1812
  10. World War II: Headline, 1941
  11. George Washington, by Gilbert Stuart, c. 1803-05
  12. Laguna Agate
  13. Spanish Conquistadors
  14. French Counter-Attack at Village of Vaux near Verdun, 1916
  15. Apache Tepees, c1909
  16. Modern Geode I
  17. The Country School
  18. Theodore Roosevelt in Office
  19. World War I, Map, 1918
  20. In A Stampede
  21. Earth Agate F
  22. Boho Periodic Table
  23. The lumbar vertebrae
  24. Martin Luther King, Jr. (1929-1968)
  25. Inquiry into the Loss of the Titanic: Cross sections of the ship
  26. Unidentified Viking scene with longship aflame
  27. Oregon. Close-up of Graveyard Point Plume Agate stone
  28. Carl Sagan
  29. Mushroom Chart I
  30. Oscar Wilde
  31. Birds Eggs I
  32. James Madison, by Gilbert Stuart , 1821
  33. Vintage Civil War poster of the Battle of Missionary Ridge
  34. A Is For Alligator
  35. Vintage Civil War Print of the Battle of Five Forks
  36. Arthritis of the neck, X-ray
  37. Van Gogh from Space - USGS Earth as Art
  38. The Fir-Tree and the Bramble, illustration from Aesop's Fables
  39. Earth Agate A
  40. A composite showing different stages of the 2010 solstice total moon eclipse
  41. Flatboat, 19th Century
  42. Stacked Agate I
  43. Stacked Agate II
  44. The Planets, excluding Pluto
  45. Map Of the Battle Of Gettysburg, 1863
  46. Titanic survivors in lifeboat
  47. Molecule Vanilin
  48. Modern Comanche, 1891