base map from U.S. Minerals Management Service, Mapping and Boundary Branch (as explained on page http://cas.gmu.edu/~tobi/thisisnow/Helen%20Reef%202000%20Monitoring%20Expedition.pdf), processed by me
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== Information == {{Information |Description=Map of Helen Reef, Palau. Based on map from U.S. Minerals Management Service Boundary Branch |Source=original source: http://cas.gmu.edu/~tobi/thisisnow/Helen%20Reef%202000%20Monitoring%20Expedition.pdf Proce
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