watchdog of the Caribbean venerable domain under american flag has new role as West Indian stronhold and sentinel of the Panama Canal Long, Edward John creator text dcu monographic eng E. John Long. In National Geographic. Publication for the year 1939. Washington, December, 1939. Illus. vol. 76-no. 6, p. 697-738. Includes Puerto Rico polychromes by Edwin L. Visherd. Puerto Rico Description and travel 931102 20160527192813.0 134949