West India Islands and the Approaches to the Panama Canal
This large folding map, issued by the London Geographical Institute during World War I, shows the islands of the Caribbean Sea and the approaches to the Panama Canal. The canal had opened to traffic in early 1914, shortly before the outbreak of the war. Protection of the canal against possible sabotage by Germany was a concern of U.S. military planners in World War I and, especially, during World War II. The map shows telegraph lines, undersea cables, and the distances in nautical miles of steamer routes from the key ...