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  1. Frogs and their Eggs
  2. Velociraptor
  3. Pachycephalosaurus
  4. The Earth's Annual Orbit
  5. Conceptual image of chromosome
  6. Definition of anthropology
  7. Artillery drill in fort during the American Civil War
  8. Joan of Arc hears heavenly voices in the Forest
  9. Mission Santa Ynez or Ines, Solvang, California
  10. 'London', plate 38 from 'Songs of Experience', 1794
  11. Joachim Murat Reviews a Company of Black Soldiers in Koenigsberg
  12. That Dam Cloud
  13. Human bones
  14. Humpty Dumpty
  15. Comet of 1811, 19th century artwork
  16. The Man and the Alembic
  17. Abstract Alphabet
  18. Conceptual image of human lungs and rib cage
  19. Old Mother Hubbard, from Old Mother Goose's Rhymes and Tales
  20. Ceratosaurus
  21. Conceptual image of DNA
  22. Microscopic view of plant tissues
  23. Conceptual image of DNA
  24. Ida B. Wells, 1891
  25. Human skeleton
  26. Soybeans, early growth, Minnesota
  27. Conceptual image of influenza causing flu
  28. Portrait of Anton Chekhov (1860-1904) 1902
  29. The muscles of the hand
  30. Vintage American history print of a younger President Theodore Roosevelt
  31. Women working in a munitions factory in 1915
  32. Portrait of Henry Knox (1759-1806)
  33. Battle of Waterloo, June 18, 1815, 3rd Grenadier of Guard commanded by Cambronne
  34. Apatosaurus
  35. 1980's UK Womans Weekly Magazine Cover
  36. Artist's concept depicting the evolution of a lobe-finned fish to an amphibian
  37. Human Skin
  38. Mankind in the Making
  39. ABCs
  40. Euoplocephalus
  41. Body Plans of Extinct Reptiles
  42. Wanted poster for Jesse James
  43. Science classroom
  44. School Days
  45. Brachiosaurus
  46. Civil War print of Abraham Lincoln riding on horseback as a crowd cheers
  47. Royal Court of French King Francis I at the Castle of Blois
  48. Chalkboard with greetings written in English, French and German