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