Princeton University
Princeton University: Qed: Mapping Globalization: Maps
Several historical maps showing steamship routes around 1900, ancient world maps, and shipping routes and lines in 1912, including those that passed through the Panama Canal.
Princeton University
Princeton University: Qed: Mapping Globalization: Map Category Queries
A large database of historical maps that can be searched by map type, time period (prehistory to 21st century), theme, and world location. Themes cover economics, war, disease, trade, migration, and much more.