With 521 major articles in the style familiar to readers of the first two parts of this award-winning series, Raymond Howgego's Encyclopedia of Exploration, 1850 to 1940: The Oceans, Islands and Polar Regions, continues the history of exploration, travel and colonization into the twentieth century. The index provides immediate access to the lives and achievements of nearly 3000 travellers, while the bibliographies cite more than 14,000 works of reference. Every expedition is placed firmly in its historical context, while the numerous cross-references serve to guide the reader between articles of similar content. Every entry is supplemented by a comprehensive bibliography of both primary and secondary sources.