"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 ID: theb2157, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Credit: Association of Commissioned Officers
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
| NOAA Disclaimer
May 12, 2014