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  1. Portrait of Samuel Adams (1722-1803)
  2. Indigo Agate D
  3. Spilled Paint - USGS Earth as Art
  4. The Summit Of Little Round Top During the Battle Of Gettysburg, 1863
  5. Moses and the Burning Bush
  6. Decorative Lintel from the ancient Mayan city of Yaxchilan, Chiapas, Mexico
  7. Vintage Civil War print of President Abraham Lincoln and his cabinet
  8. Earth
  9. Cosmic Periodic Table
  10. Grey School Chalkboard With Many Different Formulas And Signs
  11. Abraham Lincoln, 1809
  12. France, Corsica, Old Books In Ajaccio Municipal Library
  13. Young boy in school writing on chalkboard
  14. World War II painting of Winston Churchill wearing his RAF uniform
  15. Molecule Honey
  16. Microscopic view of bacteria
  17. The Hare and the Frogs, La Fontaine's Fables, 1900
  18. Pair of human hands on black background.
  19. Generator and Fan Belt in a Car Engine
  20. Science classroom
  21. Poe
  22. Oregon, Owyhee. Close-up of picture jasper stone
  23. Austenaco, Great Warrior, Commander in Chief of the Cherokee Nation
  24. Cave of Lascaux. (c.17000-15000 BC) Montignac, France
  25. Vintage American Civil War print of The Battle of Cherbourg
  26. Mars
  27. Wire Frame Render of a Clock Mechanism, Close-up
  28. Molecule Vanilin
  29. Yellowstone
  30. Vintage Civil War print of General William Tecumseh Sherman
  31. Modern Comanche, 1891
  32. Anatomy of human brain, inferior view
  33. Chiropractic skeleton
  34. Arkansas - USGS State Mosaic
  35. Keyboard Keys
  36. Colours That Reflect Joy
  37. RMS Titanic departing from Southanpton on her maiden voyage, April 5, 1912
  38. Blood clot, SEM
  39. Rice Terraces, Longsheng Ping'an, Guangxi
  40. The First Public Reading of the Declaration of Independence
  41. The Titanic's propeller in the Thompson Graving Dock of Harland
  42. The Birth of Rostam by Caesarean. Shahnameh. The Book of Kings. 16th c. Persian Art
  43. Balance
  44. Cross section biomedical illustrationBiomedical illustration of dental filling
  45. Graduated Cylinders And Flasks
  46. Row of pencils on table
  47. Houdini Diver Suit
  48. Bright Periodic Table - White, Modern Text