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![Blowup of Volcanic Region (Supposed) showing various vigias (supposed islandsor reefs that were reported to pose hazards to navigation) as well asoceanographic and meteorological phenomena map00267.jpg Blowup of Volcanic Region (Supposed) showing various vigias (supposed islandsor reefs that were reported to pose hazards to navigation) as well asoceanographic and meteorological phenomena](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_map00267.jpg?itok=nKTKM6RZ)
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Blowup of Volcanic Region (Supposed) showing various vigias (supposed islandsor reefs that were reported to pose hazards to navigation) as well asoceanographic and meteorological phenomena.Chart of Track of the U.S. Surveying Brig DOLPHIN: Samuel Phillips Lee, U.S.Navy. Commanding. Senate Executive Document No. 59. 33rd Congress, 1st Session. (Image credit: NOAA Central Library Collections)