Charts. Panama Canal. Approaches to Panama Canal, Panama, Canal Zone, Pacific Ocean, surveys in 1912, additions from surveys by U. S. Navy and Isthmian Canal Commission; chart 952. Scale 1:40,000.
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Panama Canal. Approaches to Panama Canal, Panama, Canal Zone, Pacific Ocean, surveys in 1912, additions from surveys by U. S. Navy and Isthmian Canal Commission; chart 952. Scale 1:40,000.
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Charts. Panama Canal. Approaches to Panama Canal, Panama, Canal Zone, Pacific Ocean, surveys in 1912, additions from surveys by U. S. Navy and Isthmian Canal Commission; chart 952. Scale 1:40,000.