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Secrets of the Sea

Portugal attempts to keep its maps and charts secret as European nations battle to control trade. Also, learn the origin of the term "ship's log" and hear of early Chinese voyages.

English
  • Originally Aired April 8, 1991
  • Runtime 50 minutes
  • Network PBS
  • Created October 4, 2021 by
    cnorsl
  • Modified October 4, 2021 by
    cnorsl