Coast Survey chart showing density of soundings from original survey used to to construct nautical chart. Comparing survey of Ponce Harbor, Puerto Rico to published chart of same. In: "Nautical Charts" by George Rockwell Putnam, 1908. 162 pp.
Image ID: cgs00110, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1908 • High Resolution Photo Available
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