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![The Rocas islands and atoll map00270.jpg The Rocas islands and atoll](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_map00270.jpg?itok=ztwm1J7E)
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The Rocas islands and atoll. This is the only Atlantic atoll and was positioned by Samuel Phillips Lee, commanding officer of the U.S. Surveying Brig DOLPHIN.In: Report and Charts of the Cruise 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)