books.google.com.au - Despite earlier naval expeditions undertaken for reasons of diplomacy or trade, it wasn't until the early 1400s that European maritime explorers established sea routes through most of the globe's inhabited regions, uniting a divided earth into a single system of navigation. From the early Portuguese...http://books.google.com.au/books/about/Maritime_Exploration_in_the_Age_of_Disco.html?id=YFFmpK0t98UC&utm_source=gb-gplus-shareMaritime Exploration in the Age of Discovery
