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Description
Echometre record from S. S. De Grasse.Crossing over canyon near Georges Bank.Bulletin 4 of the Association of Field Engineers, Dec. 1931, p. 83 (Image credit: Association of Commissioned Officers)
Credit
Association of Commissioned Officers
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Acoustic Sound Systems
Keywords
Charting
Soundings
Fathogram