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  1. Dice on math game
  2. General George Patton during a ticker tape parade
  3. Knights of the Round Table
  4. Map Of France, C.1900
  5. Circulatory system and brain, artwork
  6. Be Creative
  7. Alaska - USGS State Mosaic
  8. Plane over Battersea Power Station
  9. Lumbar vertebra
  10. Lovecraft
  11. Bright Periodic Table - Navy, Classic Text
  12. The bones of the lower back
  13. Ratcliffe Power Station
  14. Scanning electron micrograph of just-divided HeLa cells
  15. The Renaissance
  16. License Plate Periodic Table
  17. Civil War, Atlanta, c1863
  18. Yellowstone
  19. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  20. Pythagoras Maths Equation
  21. Bright Periodic Table - Black, Classic Text
  22. Scanning electron micrograph of an apoptotic HeLa cell
  23. Can You Help Me Please
  24. Printing Press
  25. George Washington hears his mother convince him not to go to sea as a midshipman
  26. Color Field
  27. Thel's Motto, plate 2 from The Book of Thel, 1789
  28. Officers of 4th New Jersey Infantry, American Civil War
  29. Conceptual image of DNA
  30. Fortifications in front of Atlanta, Georgia, during the American Civil War
  31. Stegosaurus
  32. Artillery park during the American Civil War
  33. Oklahoma - USGS State Mosaic
  34. Generator and Fan Belt in a Car Engine
  35. Zasite Stone With Rudby
  36. 50 Kilowatt Broadcasting Modulator
  37. Geometry tools
  38. Oil drilling rigs out in the ocean with a view of the coastline, Invergordon, Scotland
  39. Deforestation
  40. Taming of the West: The Way of the Law
  41. Frogs and their Eggs
  42. Pachycephalosaurus
  43. The Earth's Annual Orbit
  44. Conceptual image of chromosome
  45. Definition of anthropology
  46. Artillery drill in fort during the American Civil War
  47. Joachim Murat Reviews a Company of Black Soldiers in Koenigsberg
  48. The Man and the Alembic