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  1. The building of the Union Pacific Railroad
  2. Archaeopteryx
  3. The musculoskeleton of the jaw
  4. Vintage Civil War print of General William Tecumseh Sherman
  5. Virginia - USGS State Mosaic
  6. Smilodon sabertooth mother and her cubs
  7. Illinois - USGS State Mosaic
  8. Colorado - USGS State Mosaic
  9. Giant Panda
  10. Global map of Saturns moon Dione
  11. France, Corsica, Old Books In Ajaccio Municipal Library
  12. Michigan - USGS State Mosaic
  13. Benjamin Franklin, copy of 1777 painting by Jean-Baptiste Greuze
  14. New Hampshire - USGS State Mosaic
  15. Anterior view of human pelvis, with labels
  16. The Making of America: 'Hear Me, My Chiefs'
  17. Wind turbine in rural location with old barn in Cavalier County, USA
  18. Variety Of Flasks
  19. Rice Terraces, Longsheng Ping'an, Guangxi
  20. Normal knee, X-ray
  21. Joachim Murat joins the regiment of Chasseurs des Ardennes, in 1787
  22. Pylons in a rural landscape at dusk
  23. The cervical vertebrae
  24. Wyoming - USGS State Mosaic
  25. Oregon - USGS State Mosaic
  26. Molecule Estrogene
  27. Internal view of the human heart
  28. Roof of the World - USGS Earth as Art
  29. Harriet Tubman, 1911
  30. Map of Palestine, Palestina Antiqua
  31. Relief depiction of Ramses II, Temple of Luxor, Egypt
  32. Male skeleton, computer artwork.
  33. World War I, Map, c1918
  34. Tyrannosaurus
  35. Deinonychus
  36. Anterior neck and facial muscles of the human head (with labels)
  37. Row of pencils on table
  38. Ratcliffe Power Station
  39. The Renaissance
  40. Fortifications in front of Atlanta, Georgia, during the American Civil War
  41. The suffragette movement takes to the air
  42. Rib cage of human skeleton
  43. Moses and the Burning Bush
  44. x-ray of head
  45. World War I, Map, c1919
  46. Frogs and their Eggs
  47. Mrs, Jeanne Martin Cisse
  48. President Kennedy greets Peace Corps Volunteers on the White House South Lawn