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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. Spanish Conquistadors
  13. The Country School
  14. Laguna Agate
  15. Modern Geode I
  16. Apache Tepees, c1909
  17. French Counter-Attack at Village of Vaux near Verdun, 1916
  18. Theodore Roosevelt in Office
  19. World War I, Map, 1918
  20. Earth Agate F
  21. Inquiry into the Loss of the Titanic: Cross sections of the ship
  22. The lumbar vertebrae
  23. In A Stampede
  24. Van Gogh from Space - USGS Earth as Art
  25. Vintage Civil War poster of the Battle of Missionary Ridge
  26. Oregon. Close-up of Graveyard Point Plume Agate stone
  27. Boho Periodic Table
  28. Martin Luther King, Jr. (1929-1968)
  29. Unidentified Viking scene with longship aflame
  30. Mushroom Chart I
  31. Carl Sagan
  32. Birds Eggs I
  33. Oscar Wilde
  34. A Is For Alligator
  35. Vintage Civil War Print of the Battle of Five Forks
  36. Arthritis of the neck, X-ray
  37. The Fir-Tree and the Bramble, illustration from Aesop's Fables
  38. Earth Agate A
  39. A composite showing different stages of the 2010 solstice total moon eclipse
  40. The Planets, excluding Pluto
  41. Flatboat, 19th Century
  42. Titanic survivors in lifeboat
  43. Stacked Agate I
  44. Stacked Agate II
  45. Molecule Vanilin
  46. James Madison, by Gilbert Stuart , 1821
  47. Map Of the Battle Of Gettysburg, 1863
  48. No Man's Land - USGS Earth as Art