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  1. Helen Wills Moody warming up before her first round match
  2. British leaders leaving the Westminster Abby memorial service for David Lloyd George
  3. Duke of Wellington Rallying his Troops
  4. Niels Bohr, James Franck, Albert Einstein, and Isidor Rabi
  5. Blue Whale Skeleton, Hintze Hall, Natural History Museum, London, England
  6. Cardo Maximus colonnaded street, Roman city, Jerash, Jordan
  7. Mesolithic cave art
  8. Barack Obama (1961- )
  9. President Ulysses S. Grant
  10. Relief depiction of Ramses II, Temple of Luxor, Egypt
  11. Buttresses Under Foundation Of The Washington Monument
  12. Interior, Valley of the Kings, Thebes, Egypt, Africa
  13. Harriet Tubman, 1911
  14. Bowling Alley In London
  15. World War I, Map, c1918
  16. Pompeii, Campania, Italy, Europe
  17. Duke Ellington (1899-1974)
  18. Heart And Lungs, Historical Illustration
  19. Sojourner Truth (c1797-1883)
  20. Oath: Inspirational Quote and Motivational Poster
  21. Alvin Ailey (1931-1989)
  22. Distillation apparatus, 19th century
  23. American Soldiers Practicing Shooting During Spanish-American War
  24. The Renaissance
  25. John Ernst Worrell Keely
  26. Detail of relief carving of the crocodile god, Kom Ombo, Egypt, Africa
  27. Mayan archaeological site, Tulum, Yucatan, Mexico
  28. Stagecoach At Mammoth Hot Springs
  29. Fortifications in front of Atlanta, Georgia, during the American Civil War
  30. Margaret McGrath, former WASP sitting on the wing of in an XAT-6E trainer aircraft
  31. Railway signalman, 19th century
  32. Enrico Fermi, Italian-American physicist, c. 1945-50
  33. The suffragette movement takes to the air
  34. Dendera zodiac from the Temple of Hathor
  35. Jonathan Hulls' steamboat, 18th century
  36. World War I, Map, c1919
  37. Namarrgon, the Lightning Man, Kakadu National Park, Australia
  38. Statue of James Madison, Library of Congress, USA
  39. Illustration of Native Americans pointing with Pocahontas in the background
  40. Four Musicians Performing At Mountain Musical Festival, Asheville, NC, 1930's
  41. Heart anatomy, 19th Century illustration
  42. President Kennedy greets Peace Corps Volunteers on the White House South Lawn
  43. Johann Gutenberg, German inventor
  44. Mrs, Jeanne Martin Cisse
  45. Revolutionary War print of American minutemen being fired upon by British troops
  46. President Ulysses S. Grant
  47. Artificial heart, 19th century
  48. Supreme Court Of The United States By Brady